Number of
Shares

Weighted-
Average
Exercise Price

Weighted-
Average
Remaining
Contractual
Term

Aggregate
Intrinsic Value

Outstanding at December 31, 2011

39,601,640

$

2.20

Granted

7,085,680

13.48

Exercised

(5,523,840

)

0.61

Forfeited

(3,543,871

)

3.22

Cancelled

(340,167

)

1.90

Outstanding at September 30, 2012

37,279,442

$

4.48

8.51 years

$

1,274,895,101

Vested and expected to vest as of September 30, 2012

36,593,833

$

4.43

8.50 years

$

1,253,278,350

Vested and exercisable as of September 30, 2012

11,607,655

$

1.77

7.58 years

$

428,488,416