May 2011 US Online Video Rankings

comScore released data from the comScore Video Metrix service showing that 176 million U.S. Internet users watched online video content in May for an average of 15.9 hours per viewer.

The total U.S. Internet audience engaged in more than 5.6 billion viewing sessions during the course of the month. Google Sites, driven primarily by video viewing at YouTube.com, ranked as the top online video content property in May with 147.2 million unique viewers, followed by VEVO with 60.4 million viewers and Yahoo! Sites with 55.5 million viewers. Facebook.com came in fourth with 48.2 million viewers, while Viacom Digital ranked fifth with 46.5 million viewers. Google Sites had the highest number of viewing sessions with more than 2.1 billion, and highest time spent per viewer at 311 minutes, crossing the 5-hour mark for the first time.