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March 2011 US online video rankingsRESTON, US comScore, Inc, a leader in measuring the digital world, has released data from the comScore Video Metrix service showing that 174 million US Internet users watched online video content in March for an average of 14.8 hours per viewer. The total US Internet audience engaged in more than 5.7 billion viewing sessions during the course of the month. ![]() 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 March with 143.2 million unique viewers, followed by AOL, Inc. with 57.0 million viewers and Yahoo! Sites with 56.4 million viewers. Microsoft Sites came in fourth with 53.1 million viewers, while VEVO ranked fifth with 52.6 million viewers. Google Sites had the highest number of viewing sessions as it neared the 2 billion mark, and highest time spent per viewer at 276 minutes, or 4.6 hours.
Top 10 video ad properties by video ads viewedAmericans viewed 4.3 billion video ads in March, with Hulu generating the highest number of video ad impressions at more than 1.2 billion. Tremor Media Video Network ranked second overall (and highest among video ad networks) with 804.3 million ad views, followed by Adap.tv (553 million) and BrightRoll Video Network (398 million). Time spent watching videos ads neared 1.9 billion minutes during the month, with Hulu delivering the highest duration of video ads at 520 million minutes. Video ads reached 43% of the total US population an average of 33 times during the month. Hulu also delivered the highest frequency of video ads to its viewers with an average of 47 over the course of the month.
*Video ads include streaming-video advertising only and do not include other types of video monetisation, such as overlays, branded players, matching banner ads, homepage ads, etc. Other notable findings from March 2011 include:
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