Google sites have topped the online video content property in March with 143.2 million unique viewers in the US, primarily driven by video viewing at YouTube, according to a comScore report.
AOL captured second position with 57 million viewers, followed by Yahoo sites with 56.4 million viewers in March 2011.
Microsoft Sites and VEVO secured fourth and fifth position, with 53.1 million and 52.6 million viewers, respectively.
According to the report, Google sites had the highest number of viewing sessions with nearly 2 billion, and average time spent per viewer at 276 minutes, or 4.6 hours.
Americans 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 with 804.3 million ad views, followed by ADAP.TV (553 million) and BrightRoll Video Network (398 million).
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The report revealed that 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.
