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 October 2008, Americans conducted 12.6 billion core searches, up 7 percent versus September, as Google Sites maintained its top position with more than 63 percent of all core searches conducted.

Google Sites led the U.S. core search market in October with 63.1 percent of the searches conducted, up 0.2 percentage points from September, followed by Yahoo! Sites (20.5 percent), Microsoft Sites (8.5 percent), Ask Network (4.2 percent), and AOL LLC (3.7 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 12.6 billion searches at the core search engines, a 7- percent gain versus September. Google Sites handled 8 billion core searches (up 7 percent), followed by Yahoo! Sites with 2.6 billion (up 9 percent) and Microsoft Sites with 1.1 billion (up 8 percent).

In the comScore October 2008 analysis of the top properties where search activity is observed, Google Sites led with 10.8 billion searches, a 6-percent increase versus September. Yahoo! Sites ranked second with 2.7 billion searches, followed by Microsoft Sites with 1.1 billion and AOL LLC with 770 million.

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