Comscore Releases December 2008 U.S. Search Engine Rankings

RESTON, VA, January 16, 2009 – 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 December 2008, Americans conducted 12.7 billion core searches, a 3-percent increase versus November.

December 2008 U.S. Core Search Rankings

Google Sites led the U.S. core search market in December with 63.5 percent of the searches conducted, unchanged from November, followed by Yahoo! Sites (20.5 percent), Microsoft Sites (8.3 percent), Ask Network (3.9 percent), and AOL LLC (3.8 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.

Americans conducted 12.7 billion searches at the core search engines, up 3 percent from November. Google Sites handled 8 billion core searches, followed by Yahoo! Sites with 2.6 billion and Microsoft Sites with 1.1 billion.

* 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.

December U.S. Expanded Search Rankings

In the Comscore December 2008 analysis of the top properties where search activity is observed, Google Sites led with 11.2 billion searches, up 4 percent versus November. Yahoo! Sites ranked second with 2.7 billion searches, followed by Microsoft Sites with 1.1 billion and AOL LLC with 740 million.

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