RESTON, VA, December 23, 2015 – Comscore, Inc. (NASDAQ: SCOR), a global media measurement and analytics company, today released data from the Comscore Video Metrix® service showing that 197.5 million Americans watched online content videos via desktop computer in November 2015. Google Sites ranked as the top video content property, LiveRail was the top video ad property, and VEVO topped the list of YouTube partner channels.

Top 10 Video Content Properties by Unique Viewers

Google Sites, driven primarily by video viewing at YouTube.com, ranked as the top online video content property in November with 174.5 million unique viewers. Facebook ranked #2 with 90.5 million viewers, followed by Yahoo Sites with 61.2 million, Vimeo with 56.5 million and VEVO with 44.2 million.

Top U.S. Online Video* Content Properties Ranked by Unique Video Viewers

November 2015

Total U.S. – Desktop Computer, Home and Work Locations

Content Videos Only (Ad Videos Not Included)

Source: Comscore Video Metrix Property Total Unique Viewers (000) Total Internet : Total Audience 197,464 Google Sites 174,548 Facebook 90,474 Yahoo Sites 61,214 Vimeo 56,455 VEVO 44,205 Warner Music 39,269 Mode Media 37,913 Comcast NBCUniversal 37,799 Maker Studios Inc. 37,546 AOL, Inc. 33,281

*A video is defined as any streamed segment of audiovisual content, including both progressive downloads and live streams. For long-form, segmented content, (e.g. television episodes with ad pods in the middle) each segment of the content is counted as a distinct video stream. Video views are inclusive of both user-initiated and auto-played videos that are viewed for longer than 3 seconds.

Top 10 Video Ad Properties by Unique Viewer Percent Reach

LiveRail ranked #1 in video ad reach, serving ads to 48.2 percent of the total U.S. population in November. AOL, Inc. came in second with 45 percent reach, followed by BrightRoll Platform with 43 percent, Google Sites with 33 percent and SpotX Video Advertising Platform with 30.5 percent.

Top U.S. Online Video Ad* Properties Ranked by Percent Reach of U.S. Population

November 2015

Total U.S. – Desktop Computer, Home and Work Locations

Ad Videos Only (Content Videos Not Included)

Source: Comscore Video Metrix Property % Reach Total U.S. Population LiveRail† 48.2 AOL, Inc. 45.0 BrightRoll Platform† 43.0 Google Sites 33.0 SpotX Video Advertising Platform† 30.5 Specific Media** 27.8 Altitude Digital† 23.9 RockYou.com† 21.5 Teads Sites† 21.5 Videology† 20.6

*Video ads include streaming-video advertising only and do not include other types of video monetization, such as overlays, branded players, matching banner ads, etc.

**Indicates video ad network

†Indicates video ad exchange/DSP/SSP

Top 10 YouTube Partner Channels by Unique Viewers

The November 2015 YouTube partner data revealed that video music channel VEVO climbed into the top position in the ranking with 43.4 million viewers. UMG occupied the #2 spot with 42.2 million unique viewers, followed by Warner Music with 39.3 million, SonyBMG with 37.7 million and BroadbandTV with 28.1 million.

Top YouTube Partner Channels Ranked by Unique Video Viewers*

November 2015

Total U.S. – Desktop Computer, Home and Work Locations

Content Videos Only (Ad Videos Not Included)

Source: Comscore Video Metrix Property Total Unique Viewers (000) VEVO @ YouTube 43,402 UMG @ YouTube 42,194 Warner Music @ YouTube 39,268 SonyBMG @ YouTube 37,688 BroadbandTV @ YouTube 28,105 QuizGroup @ YouTube 22,244 The Orchard @ YouTube 21,650 ZEFR @ YouTube 21,158 Machinima @ YouTube 20,254 Collective @ YouTube 18,702

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About Comscore

Founded in 1999 and headquartered in Reston, Virginia, Comscore, Inc. (NASDAQ: SCOR) is a global media measurement and analytics company that makes audiences and advertising more valuable across all the screens that matter. Comscore helps media buyers and sellers understand and make decisions based on how consumers use different media, such as TV, video, mobile, desktop and more. Through its products and services, Comscore helps its more than 2,500 clients understand their audiences, know if their advertising is working, and access data where they want and need it. Please visit www.comscore.com to learn more.