172 million US Internet users watched online video content in December 2010
Google sites have topped the online video content property with 144.8 million unique viewers in the US, primarily driven by video viewing at YouTube.com.
Yahoo! sites stood second with 53.1 million viewers, followed by VEVO with 50.6 million viewers in the month of December 2010.
AOL, secured fourth place with 48.6 million viewers and Viacom Digital had 45.9 million viewers.
According to the report, Google sites had the highest number of viewing sessions with nearly 1.9 billion, and average time spent per viewer at 274 minutes, or 4.6 hours.
Americans viewed more than 5.9 billion video ads in December, 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 1.1 billion ad views, followed by ADAP.TV (682 million) and BrightRoll Video Network (588 million).
Video ads reached 49.1% of the total US population with an average of 39.8 times during the month, and Hulu delivered the highest frequency of video ads to its viewers with an average of 47.1 over the course of the month.
The report revealed that 84.6% of the US Internet audience viewed online video, and the duration of the average online content video was 5 minutes, while the average online video ad was 0.4 minutes.
Further, video ads accounted for 16.4% of all videos viewed and 1.6% of all minutes spent viewing video online.