10/01/2008 05:12 am ET Updated May 25, 2011

Evaluating YouTube's Dominance

Each month we hear about how much share of the online video market YouTube (GOOG) has hoovered up. But each month we also get two different pictures of YouTube's dominance: One from Nielsen and one from comScore (SCOR).

When comScore releases its Video Metrix figures for June next week, it will put YouTube at 39% of the video market. It says YouTube accounted for 4.2 billion out of 10.8 billion videos watched in the U.S. that month.

Nielsen's VideoCensus for June, though, give YouTube some 51% of the market, with 4 billion of 7.9 billion total views. In July, Nielsen had YouTube with nearly 60% of the market, with 5 billion of 8.5 billion total U.S. views.

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