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comScore's May Online Video Rankings: YouTube and Vevo Surge

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Online video's reach is constantly expanding, and comScore's monthly rankings of viewership and ad reach give the best quantification of that trend. The research company has just released its numbers for May, and while it's no surprise that YouTube and Vevo have again taken the top spots, it's interesting to see how much they've grown.

Google sites (which include YouTube) had 147 million unique visitors in May, watching an average of 311.2 minutes of video each. Compare that to April, when the site had 142 million uniques averaging 286.1 minutes of video.

Music video site Vevo also had a banner month, with 60 million unique visitors watching an average of 105.1 minutes of video. That's a big jump from the 55 million unique visitors in April.

Next up come Yahoo sites (55.5 million), Facebook (48.1 million), and Viacom Digital (46.5 million). Rounding out the top ten are Microsoft sites, AOL, Turner Digital, NBC Universal, and Hulu. Those are the same ten as in April, but Viacom gained a few places and Microsoft lost a few.

Hulu is once again the ad leader, showing 1.3 billion video ads in May to 9.2 percent of the U.S. population, with the average viewer seeing 47.6 ads. Compare that to April, when it showed 1.1 billion ads to 8.4 percent of the population. Following Hulu in the number of video ads served were Tremor (700.8 million, Adap.tv (641.6 million), BrightRoll (564.9 million), Undertone (291.2 million), Microsoft sites (268.4 million), Viacom Digital (265.8 million), CBS Interactive (258.8 million), SpotXchange (257.8 million), and ABC Television (181.7). BrightRoll reached the largest percentage of the population with 26.4 percent.

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