U.S. Online Display Advertising Market Delivers 1.1 Trillion Impressions in Q1 2011

Facebook.com Now Accounts for Nearly 1 in 3 Online Display Ads in U.S.

RESTON, VA, May 4, 2011 � comScore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released an overview of the U.S. online display advertising market for Q1 2011 based on data from comScore Ad Metrix, indicating that nearly 1.11 trillion display ads were delivered to U.S. Internet users during the quarter. Facebook accounted for 346 billion impressions, nearly double the number it delivered in Q1 2010, and accounting for nearly one third of all display ad impressions delivered.

�The U.S. online display advertising market maintained its strong momentum from last year with a terrific first quarter,� said Jeff Hackett, comScore executive vice president. �We are now seeing more than one trillion display ads delivered every single quarter and nearly 300 individual advertisers spending at least $1 million a quarter on display, numbers which underscore just how large and vibrant the online medium has become. And it�s not just about the volume but about the quality of the advertising experience that can be delivered as we see continued investment in compelling, high-quality creative that helps cultivate long-term brand equity.�