More than 75 percent of US internet users watched a video online (either streaming video or progressive downloads) in November, averaging 3.25 hours per person, up 29 percent from January, according to comScore's Video Metrix report, writes MarketingCharts.

Google Sites, including YouTube.com, increased video market share by more than two percentage points, to 31.3 percent, from October to November, comScore said.

Americans viewed nearly 9.5 billion online videos in November, with Google Sites again ranking as top US video property with 3.0 billion videos viewed, 2.9 billion of which occurred at YouTube.com (30.6 percent share of all videos viewed).

Fox Interactive Media ranked second, with 419 million videos viewed (4.4 percent), followed by Yahoo Sites with 328 million (3.5 percent) and Viacom Digital with 304 million (2.6 percent).

In total, 138 million Americans — approximately three in four US internet users — viewed online video in November.

Google Sites captured the largest online video audience with 76.2 million unique viewers, followed by Fox Interactive Media with 46.3 million and Yahoo! Sites with 37.3 million.

Other notable findings from Nov. 2007:

• 74.5 million people viewed 2.9 billion videos on YouTube.com (39 videos per viewer).
• 43.2 million people viewed 389 million videos on MySpace.com (9 videos per viewer).
• Online viewers watched an average of 3.25 hours (195 minutes) of online video during the month, representing a 29 percent gain from the 2.52 hours (151 minutes) watched in January 2007.
• The average online video duration was 2.8 minutes.
• The average online video viewer consumed 69 videos.