Internet users in the U.S. watched 14.5 billion online videos last month, an increase of 26% from March 2008, while the average amount of time spent watching Web video content per month jumped 92 minutes to nearly 5.5 hours, according to research firm comScore.
Google's YouTube topped the list, generating some 5.9 billion videos viewed in March (40.9% market share), followed by Fox Interactive Media (which owns MySpace) with 437 million videos.
Fast-rising Hulu, the joint venture between NBC Universal and News Corp., came in third with 380 million views. In March, Hulu represented 2.6% of videos viewed, but 4.9% all minutes spent watching online video.
Rounding out the top 10 for the month were: Yahoo (334.7 million views), Microsoft (288.2 million), Viacom (277.8 million), CBS Interactive (191.7 million), Turner (167.3 million), Disney Online (125.2 million) and Time Warner's AOL (105.2 million).
YouTube and other Google sites had 100.4 million unique viewers in March, followed by Fox Interactive Media with 55.2 million, Yahoo with 42.5 million, Hulu with 41.6 million and CBS Interactive with 35.4 million.
ComScore's Video Metrix rankings are based on video-content Web sites. Online video includes both streaming and progressive download video.