RESTON, VA, May 16, 2014 – Comscore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released its monthly Comscore qSearch™ analysis of the U.S. search marketplace. Google Sites led the explicit core search market in April with 67.6 percent of search queries conducted.

U.S. Explicit Core Search

Google Sites led the U.S. explicit core search market in April with 67.6 percent market share (up 0.1 percentage points), followed by Microsoft Sites with 18.7 percent (up 0.1 percentage points) and Yahoo Sites with 10 percent. Ask Network accounted for 2.4 percent of explicit core searches, followed by AOL, Inc. with 1.3 percent.

Comscore Explicit Core Search Share Report*

April 2014 vs. March 2014

Total U.S. – Home & Work Locations

Source: Comscore qSearch Core Search Entity Explicit Core Search Share (%) Mar-14 Apr-14 Point Change Total Explicit Core Search 100.0% 100.0% N/A Google Sites 67.5% 67.6% 0.1 Microsoft Sites 18.6% 18.7% 0.1 Yahoo Sites 10.1% 10.0% -0.1 Ask Network 2.5% 2.4% -0.1 AOL, Inc. 1.3% 1.3% 0.0

*“Explicit Core Search” excludes contextually driven searches that do not

reflect specific user intent to interact with the search results.

18.6 billion explicit core searches were conducted in April, with Google Sites ranking first with 12.6 billion. Microsoft Sites ranked second with 3.5 billion searches, followed by Yahoo Sites with 1.9 billion, Ask Network with 445 million and AOL, Inc. with 243 million.

Comscore Explicit Core Search Query Report

April 2014 vs. March 2014

Total U.S. – Home & Work Locations

Source: Comscore qSearch Core Search Entity Explicit Core Search Queries (MM) Mar-14 Apr-14 Percent Change Total Explicit Core Search 19,358 18,597 -4% Google Sites 13,067 12,576 -4% Microsoft Sites 3,594 3,475 -3% Yahoo Sites 1,960 1,857 -5% Ask Network 478 445 -7% AOL, Inc. 259 243 -6%

“Powered By” Reporting

In April, 69.0 percent of searches carried organic search results from Google (up 0.1 percentage points), while 26.6 percent of searches were powered by Bing.

About Comscore

Comscore, Inc. (NASDAQ: SCOR) is a global leader in digital measurement and analytics, delivering insights on web, mobile and TV consumer behavior that enable clients to maximize the value of their digital investments. For more information, please visit www.comscore.com/companyinfo.