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Employee Benefit Plans
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Employee Benefit Plans Employee Benefit Plans
Restricted Stock Unit Activity

The following table presents restricted stock unit (“RSU”) activity under our equity incentive plans as of and for the three months ended March 31, 2021 (in millions):  
 
Units (1)
Outstanding as of January 1, 202125 
Awarded
Vested(4)
Forfeited(1)
Outstanding as of March 31, 202122 
(1) Activity presented is inclusive of units granted to employees of our Classifieds business

The weighted average grant date fair value for RSUs awarded during the three months ended March 31, 2021 was $59.75 per share.

Stock-Based Compensation Expense

The impact on our results of continuing operations of recording stock-based compensation expense was as follows (in millions):
Three Months Ended
March 31,
 20212020
Cost of net revenues$10 $10 
Sales and marketing22 16 
Product development43 36 
General and administrative31 30 
Total stock-based compensation expense$106 $92 
Capitalized in product development$$