comScore's July video metrix states that the number of U.S. users watching online video content rising slightly to 178 million viewers compared to 177 million total viewers in June. In July, each viewer watched an an average of 14.7 hours of online video. And 84.9% of the total U.S. Internet audience viewed online video.
YouTube ranked as the top with 143.2, followed by Yahoo Sites with 55.1, Facebook's jumped one position to capture the third spot with 46.6 million viewers, compared to 43 million viewers in June.
comScore also reported video ad metrics, "Hulu generating highest number of video ad impressions at 783 million. Tremor Media Video Network ranked second with 452 million ad views, followed by BrightRoll Video Network (248 million) and Microsoft Sites (232 million).