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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Selling and marketing with a related party	$ 61,071	$ 51,361
Cost of revenue
Stock-based compensation	1,061	919
Selling and marketing
Stock-based compensation	4,265	4,445
Technology and content
Stock-based compensation	5,395	4,284
General and administrative
Stock-based compensation	7,714	7,303
Acquisition-related and other
Stock-based compensation	$ 56,643

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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