comScore Releases May Online Video Rankings; Google Ranks at the Top

comScore, Inc. (NASDAQ: SCOR) today released data from the comScore Video Metrix service showing that 176 million U.S. Internet users watched online video content in May for an average of 15.9 hours per viewer. The total U.S. Internet audience engaged in more than 5.6 billion viewing sessions during the course of the month.

Google (NASDAQ: GOOG) Sites, driven primarily by video viewing at YouTube.com, ranked as the top online video content property in May with 147.2 million unique viewers, followed by VEVO with 60.4 million viewers and Yahoo! (NASDAQ: YHOO) Sites with 55.5 million viewers. Facebook.com came in fourth with 48.2 million viewers, while Viacom Digital ranked fifth with 46.5 million viewers. Google Sites had the highest number of viewing sessions with more than 2.1 billion, and highest time spent per viewer at 311 minutes, crossing the 5-hour mark for the first time.

Americans viewed 4.6 billion video ads in May, with Hulu generating the highest number of video ad impressions at more than 1.3 billion. Tremor Media Video Network ranked second overall (and highest among video ad networks) with 700.8 million ad views, followed by Adap.tv (642 million) and BrightRoll Video Network (565 million).

Time spent watching videos ads totaled more than 2.0 billion minutes during the month, with Hulu delivering the highest duration of video ads at 560 million minutes. Video ads reached 45 percent of the total U.S. population an average of 34 times during the month. Hulu also delivered the highest frequency of video ads to its viewers with an average of 48 over the course of the month.