The long tail of video sites in the US account for 52% of all time spent watching video

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"According to comScore’s 2009 U.S. Digital Year in Review, more than half of all time spent watching videos on the Web (52 percent) last year was on Long Tail video sites beyond the top 25. What you see is a real barbell distribution, with Youtube on one end and the Long Tail sites on the other. Total video views more than doubled between December, 2008 and December, 2009, from 14 billion to 33 billion streams. So there is hope yet for niche video producers.
The Nos. 2 through 25 sites account for the remaining 22 percent of video minutes. This group includes No. 2 video site Hulu, which just hit 1 billion monthly video streams in December, and fast-rising Netflix (no. 19). Hulu’s 1 billion streams accounted for 5.8 billion minutes of viewing time, up 140 percent from a year before."
Source: comScore’s 2009 U.S. Digital Year in Review, reported by Techcrunch, 8th February 2010