Some 171 million US Internet users watched online video in January 2011, engaging in nearly 4.9 billion viewer sessions during the month, according to comScore Video Metrix. Google Sites, driven primarily by viewing at YouTube, was the top video content property, attracting 144.1 million unique viewers, followed by Vevo with 51.0 million.
Yahoo Sites was third with 48.7 million viewers, followed by Viacom Digital with 48.1 million and AOL with 44.5 million.
Google Sites had the highest number of viewer sessions during the month (1.9 billion), while second-ranked Vevo had 121.0 million sessions, roughly 6.3% of Google's volume.
Some 83.5% of the US Internet audience viewed online videos in January for an average of 14.5 hours per viewer.
The duration of the average online content video was 5.0 minutes, while the average online video ad was 0.4 minutes.
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