comScore Releases May 2009 U.S. Search Engine Rankings

Ad Operations OnlineRESTON, VA, June 17, 2009 – comScore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, released its monthly comScore qSearch analysis of the U.S. search marketplace. In May 2009, Americans conducted 14.3 billion core searches.

May 2009 U.S. Core Search Rankings

Google Sites led the U.S. core search market in April with 65.0 percent of the searches conducted, followed by Yahoo! Sites (20.1 percent), Microsoft Sites (8.0 percent), Ask Network (3.9 percent) and AOL LLC (3.1 percent).

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comScore Core Search Report*

May 2009 vs. April 2009
Total U.S. – Home/Work/University Locations
Source: comScore qSearch

Core Search Entity               Share of Searches (%)
Apr-09         May-09        Point Change
May-09 vs. Apr-09

Total Core Search        100.0          100.0            N/A

Google Sites              64.2           65.0            0.8
Yahoo! Sites              20.4           20.1           -0.3
Microsoft Sites**          8.2            8.0           -0.2
Ask Network                3.8            3.9            0.1
AOL LLC                    3.4            3.1           -0.3
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* 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.

**May data does not include search activity at Microsoft Bing, which was launched on June 1. Microsoft Bing will be included with June qSearch data.

Americans conducted 14.3 billion searches at the core search engines. Google Sites accounted for 9.3 billion core searches, followed by Yahoo! Sites with 2.9 billion and Microsoft Sites with 1.1 billion.

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comScore Core Search Report*

May 2009 vs. April 2009
Total U.S. – Home/Work/University Locations
Source: comScore qSearch

Core Search Entity               Search Queries (MM)
Apr-09        May-09      Percent Change
May-09 vs. Apr-09

Total Core Search        14,751        14,327           -3

Google Sites              9,476         9,307           -2
Yahoo! Sites              3,008         2,877           -4
Microsoft Sites**         1,208         1,149           -5
Ask Network                 563           555           -1
AOL LLC                     496           438          -12
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* 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.

**May data does not include search activity at Microsoft Bing, which was launched on June 1. Microsoft Bing will be included with June qSearch data.

May 2009 U.S. Expanded Search Rankings

In the comScore May 2009 analysis of the top properties where search activity is observed, Google Sites led with 13 billion searches. Yahoo! Sites ranked second with 3 billion searches, followed by Microsoft Sites (1.2 billion) and AOL LLC (721 million).

Please refer to the following link for the Expanded Search Rankings: http://www.comscore.com/Press_Events/Press_Releases/2009/6/comScore_Releases_May_2009_U.S._Search_Engine_Rankings

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