The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

Names of reporting persons

Granite Global Ventures III L.P.

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Delaware, United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

1,579,471 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

1,579,471 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

1,579,471 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

3.3% (3)

(12)

Type of reporting person (see instructions)

PN

This statement on Schedule 13G is filed by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures III L.L.C., Granite Global Ventures II L.P., GGV II Entrepreneurs Fund L.P., Granite Global Ventures II L.L.C., Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee (collectively, the “Reporting Persons”). These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P. and (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

Names of reporting persons

GGV III Entrepreneurs Fund L.P.

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Delaware, United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

1,579,471 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

1,579,471 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

1,579,471 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

3.3% (3)

(12)

Type of reporting person (see instructions)

PN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P. and (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

Names of reporting persons

Granite Global Ventures III L.L.C.

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Delaware, United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

1,579,471 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

1,579,471 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

1,579,471 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

3.3% (3)

(12)

Type of reporting person (see instructions)

OO

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P. and (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

Names of reporting persons

Granite Global Ventures II L.P.

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Delaware, United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

1,187,504 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

1,187,504 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

1,187,504 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

2.5% (3)

(12)

Type of reporting person (see instructions)

PN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (ii) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

CUSIP No. 7487Q 10 0

Names of reporting persons

GGV II Entrepreneurs Fund L.P.

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Delaware, United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

1,187,504 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

1,187,504 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

1,187,504 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

2.5% (3)

(12)

Type of reporting person (see instructions)

PN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (ii) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

CUSIP No. 7487Q 10 0

Names of reporting persons

Granite Global Ventures II L.L.C.

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Delaware, United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

1,187,504 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

1,187,504 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

1,187,504 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

2.5% (3)

(12)

Type of reporting person (see instructions)

OO

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (ii) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

CUSIP No. 7487Q 10 0

Names of reporting persons

Scott B. Bonham

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Canada

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

2,766,975 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

2,766,975 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

2,766,975 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

5.8% (3)

(12)

Type of reporting person (see instructions)

IN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P., (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P., (iii) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (iv) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C and Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

CUSIP No. 7487Q 10 0

Names of reporting persons

Hany M. Nada

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

2,766,975 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

2,766,975 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

2,766,975 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

5.8% (3)

(12)

Type of reporting person (see instructions)

IN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P., (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P., (iii) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (iv) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C and Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

CUSIP No. 7487Q 10 0

Names of reporting persons

Thomas K. Ng

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

2,766,975 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

2,766,975 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

2,766,975 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

5.8% (3)

(12)

Type of reporting person (see instructions)

IN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P., (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P., (iii) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (iv) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C and Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

CUSIP No. 7487Q 10 0

Names of reporting persons

Jixun Foo

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Singapore

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

2,766,975 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

2,766,975 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

2,766,975 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

5.8% (3)    

(12)

Type of reporting person (see instructions)

IN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P., (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P., (iii) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (iv) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C and Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

Names of reporting persons

Glenn Solomon

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

United States of America

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

51,250 (2)

(6)

Shared voting power

2,766,975 (3)

(7)

Sole dispositive power

51,250 (2)

(8)

Shared dispositive power

2,766,975 (3)

  (9)

Aggregate amount beneficially owned by each reporting person

2,818,225 (2)(3)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

5.9% (4)

(12)

Type of reporting person (see instructions)

IN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Represents (i) a fully vested stock option for 25,000 shares, (ii) a fully vested stock option for 20,000 shares and (iii) a stock option for 25,000 shares of which 6,250 shares have vested or will vest within 60 days.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P., (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P., (iii) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (iv) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C and Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011, plus 51,250 shares which could be acquired by Glenn Solomon within 60 days of December 31, 2011.

Names of reporting persons

Jenny Lee

Check the appropriate box if a member of a group (see instructions)

(a)  ¨        (b)  x (1)

SEC use only

Citizenship or place of organization

Singapore

Number of

shares

beneficially

owned by

each

reporting

person

with:

(5) 

Sole voting power

0

(6)

Shared voting power

2,766,975 (2)

(7)

Sole dispositive power

0

(8)

Shared dispositive power

2,766,975 (2)

  (9)

Aggregate amount beneficially owned by each reporting person

2,766,975 (2)

(10)

Check if the aggregate amount in Row (9) excludes certain shares (see instructions)    ¨

(11)

Percent of class represented by amount in Row (9)

5.8% (3)

(12)

Type of reporting person (see instructions)

IN

This statement on Schedule 13G is filed by the Reporting Persons. These Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

Consists of (i) 1,541,880 shares of Common Stock held by Granite Global Ventures III L.P., (ii) 37,591 shares of Common Stock held by GGV III Entrepreneurs Fund L.P., (iii) 1,163,163 shares of Common Stock held by Granite Global Ventures II L.P. and (iv) 24,341 shares of Common Stock held by GGV II Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C and Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

CUSIP No. 7487Q 10 0

Name

Citizenship or Place of Organization

1. Granite Global Ventures III L.P.

Delaware, United States of America

2. GGV III Entrepreneurs Fund L.P.

Delaware, United States of America

3. Granite Global Ventures III L.L.C.

Delaware, United States of America

4. Granite Global Ventures II L.P.

Delaware, United States of America

5. GGV II Entrepreneurs Fund L.P.

Delaware, United States of America

6. Granite Global Ventures II L.L.C.

Delaware, United States of America

7. Scott B. Bonham

Canada

8. Hany M. Nada

United States of America

9. Thomas K. Ng

United States of America

10. Jixun Foo

Singapore

11. Glenn Solomon

United States of America

12. Jenny Lee

Singapore

Reporting Persons

Granite Global Ventures III L.P.

GGV III Entrepreneurs Fund L.P.

Granite Global Ventures III L.L.C. (2)

Granite Global Ventures II L.P.

GGV II Entrepreneurs Fund L.P.

Granite Global Ventures II L.L.C. (2)

Scott B. Bonham

Hany M. Nada

Thomas K. Ng

Jixun Foo

Glenn Solomon

Jenny Lee

Represents the number of shares of Common Stock currently underlying all Securities held by the Reporting Persons.

Granite Global Ventures III L.L.C. is the sole general partner of Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. As such, Granite Global Ventures III L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P. and GGV III Entrepreneurs Fund L.P. Granite Global Ventures III L.L.C. owns no securities of the Issuer directly. Granite Global Ventures II L.L.C. is the sole general partner of Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. As such, Granite Global Ventures II L.L.C. possesses power to direct the voting and disposition of the shares owned by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Granite Global Ventures II L.L.C. owns no securities of the Issuer directly. Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee are members of the Investment Committee of Granite Global Ventures II L.L.C and Managing Directors of Granite Global Ventures III L.L.C. As such, Messrs. Scott B. Bonham, Jixun Foo, Glenn Solomon, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee possess power to direct the voting and disposition of the shares owned by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. and may be deemed to have indirect beneficial ownership of the shares held by Granite Global Ventures III L.P., GGV III Entrepreneurs Fund L.P., Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P. Messrs. Scott B. Bonham, Jixun Foo, Hany M. Nada, Thomas K. Ng and Ms. Jenny Lee own no securities of the Issuer directly.

This percentage is calculated based upon 47,641,625 shares of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011.

This percentage is calculated based upon 47,641,625 of the Issuer’s Common Stock outstanding on its most recently filed quarterly report on Form 10-Q for the period ended September 30, 2011, plus 51,250 shares which could be acquired by Glenn Solomon within 60 days of December 31, 2011.

CUSIP No. 7487Q 10 0

GRANITE GLOBAL VENTURES III L.P.

GGV III ENTREPRENEURS FUND L.P.

BY:

ITS:

GRANITE GLOBAL VENTURES III L.L.C.

GENERAL PARTNER

Hany M. Nada

Managing Director

Hany M. Nada

Managing Director

GRANITE GLOBAL VENTURES II L.P.

GGV II ENTREPRENEURS FUND L.P.

BY:

ITS:

GRANITE GLOBAL VENTURES II L.L.C.

GENERAL PARTNER

Hany M. Nada

Managing Director

Hany M. Nada

Managing Director

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

Hany M. Nada as Attorney-in-fact for Scott B. Bonham

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada

/s/ Hany M. Nada