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Comscore Reports January 2010 U.S. Mobile Subscriber Market Share

Use of Social Media via Mobile Sees Considerable Gains in Past Three Months

RESTON, VA, March 10, 2010 – Comscore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released data from the Comscore MobiLens service, reporting key trends in the U.S. mobile phone industry during the three month period between October 2009 and January 2010. The report ranked the leading mobile original equipment manufacturers (OEMs) and smartphone operating system (OS) platforms in the U.S. according to their share of current mobile subscribers age 13 and older, as well as popular activities and content accessed via the subscriber’s primary mobile phone. The January report found Motorola to be the top handset manufacturer overall with 22.9 percent market share, while RIM led among smartphone platforms with 43.0 percent market share.

OEM Market Share

In the 3 month average ending in January, 234 million Americans were mobile subscribers ages 13 and older, with device manufacturer Motorola ranking as the top OEM with 22.9 percent of U.S. mobile subscribers. LG ranked second with 21.7 percent share, followed by Samsung (21.1 percent share), Nokia (9.1 percent share) and RIM (7.8 percent share).

Top Mobile OEMs

3 Month Avg. Ending Jan. 2010 vs. 3 Month Avg. Ending Oct. 2009

Total U.S. Age 13+

Source: Comscore MobiLens Share (%) of Mobile Subscribers Oct-09 Jan-10 Point Change Total Mobile Subscribers 100.0% 100.0% N/A Motorola 24.1% 22.9% -1.2 LG 22.0% 21.7% -0.3 Samsung 21.0% 21.1% 0.1 Nokia 9.3% 9.1% -0.2 RIM 6.4% 7.8% 1.4

Smartphone Platform Market Share

42.7 million people in the U.S. owned smartphones in an average month during the November to January period, up 18 percent from the August through October period. RIM was the leading mobile smartphone platform in the U.S. with 43.0 percent share of U.S. smartphone subscribers, rising 1.7 percentage points versus three months earlier. Apple ranked second with 25.1 percent share (up 0.3 percentage points), followed by Microsoft at 15.7 percent, Google at 7.1 percent (up 4.3 percentage points), and Palm at 5.7 percent. Google’s Android platform continues to see rapid gains in market share.

Top Smartphone Platforms

3 Month Avg. Ending Jan. 2010 vs. 3 Month Avg. Ending Oct. 2009

Total U.S. Age 13+

Source: Comscore MobiLens Share (%) of Smartphone Subscribers Oct-09 Jan-10 Point Change Total Smartphone Subscribers 100.0% 100.0% N/A RIM 41.3% 43.0% 1.7 Apple 24.8% 25.1% 0.3 Microsoft 19.7% 15.7% -4.0 Google 2.8% 7.1% 4.3 Palm 7.8% 5.7% -2.1

Mobile Content Usage

In an average month during the November through January 2010 time period, 63.5 percent of U.S. mobile subscribers used text messaging on their mobile device, up 1.5 percentage points versus three months prior. Browsers were used by 28.6 percent of U.S. mobile subscribers (up 1.8 percentage points), while subscribers who played games made up 21.7 percent (up 0.4 percentage points). Access of social networking sites or blogs experienced strong gains in the past three months, growing 3.3 percentage points to 17.1 percent of mobile subscribers.

Mobile Content Usage

3 Month Avg. Ending Jan. 2010 vs. 3 Month Avg. Ending Oct. 2009

Total U.S. Age 13+

Source: Comscore MobiLens Share (%) of U.S. Mobile Subscribers Oct-09 Jan-10 Point Change Total Mobile Subscribers 100.0% 100.0% N/A Sent text message to another phone 62.0% 63.5% 1.5 Used browser 26.8% 28.6% 1.8 Played games 21.3% 21.7% 0.4 Used Downloaded Apps 18.3% 19.8% 1.5 Accessed Social Networking Site or Blog 13.8% 17.1 % 3.3 Listened to music on mobile phone 11.6% 12.8% 1.2

About Comscore

Comscore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital marketing intelligence.

Contact:

Andrew Lipsman

Comscore, Inc.

+1 312 775 6510

press@comscore.com