Comscore Releases March 2010 U.S. Search Engine Rankings

RESTON, VA, April 12, 2010 – Comscore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released its monthly Comscore qSearch analysis of the U.S. search marketplace. In March 2010, Americans conducted 15.4 billion core searches, with Google Sites accounting for 65.1 percent search market share.

March 2010 U.S. Core Search Rankings

Google Sites led the U.S. core search market in March with 65.1 percent of the searches conducted, followed by Yahoo! Sites (16.9 percent), and Microsoft Sites (11.7 percent). Ask Network captured 3.8 percent of the search market, followed by AOL LLC with 2.5 percent.

* Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.
** Due to a change in the URL structure for certain Google News & Video searches, a portion of searches previously counted were excluded. Comscore estimates that these searches were responsible for a reduction in Google’s Core Search share of approximately 10 basis points or 0.1%.

Americans conducted 15.4 billion searches in March, up 7 percent from February. Google Sites accounted for 10.0 billion searches, followed by Yahoo! Sites (2.6 billion), Microsoft Sites (1.8 billion), Ask Network (593 million) and AOL LLC (380 million).

* Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.

March 2010 U.S. Expanded Search Rankings

In the March analysis of the top properties where search activity is observed, Google Sites led the search market with 14.3 billion search queries, followed by Yahoo! Sites with 2.7 billion queries and Microsoft Sites with 1.9 billion. Facebook.com experienced significant growth during the month with a 48-percent increase to 647 million searches, jumping one position in the ranking.

About Comscore
Comscore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital marketing intelligence. For more information, please visit www.comscore.com/companyinfo.

Press
Bill Daddi
Daddi Brand Communications
646-370-1341
press@comscore.com