comScore has released an overview of the U.S. online display advertising market for Q1 2011 based on data from comScore Ad Metrix, indicating 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.
Facebook led all online publishers in Q1 2011 with 346 billion display ad impressions, representing 31.2 percent market share. Facebook’s market share has increased 15 percentage points from 16.2 percent in Q1 2010. Yahoo! Sites ranked second during the most recent quarter with 112 billion impressions (10.1 percent), followed by Microsoft Sites with 54 billion impressions (4.8 percent) and AOL, Inc. with 33 billion impressions (3.0 percent).
AT&T ranked as the top online display advertiser in the first quarter with 19.5 billion impressions, accounting for 1.8 percent of display ads. Experian Interactive ranked second with 16.6 billion impressions (1.5 percent), followed by Scottrade ranked third with 11.2 billion (1.0 percent) and Intuit with 11 billion (1.0 percent). Groupon entered the top ten display advertisers at #7 with 7.7 billion impressions (0.7 percent).
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