Google's YouTube accounted for 73.18 percent of all US visits in March among a custom category of 68 online video websites, with second-place MySpaceTV receiving 9.21 percent, followed by Google Video with 4.06 percent, according to Hitwise - via MarketingCharts.

YouTube visits increased 32 percent from March '07, while MySpaceTV visits dropped significantly (-48 percent), Hitwise said. More findings, below.

Top 5 Online Video Sites

Among the highlights:

• The "Online Video" category accounted for 1.09 percent of all US Internet visits in March 2008, a decline of 7 percent compared with March 2007.
• Despite the decrease in US visits, the amount of time spent on the websites increased 7 percent for the week ended April 5, 2008.
• Hulu.com, which came out of beta the week ended March 15, was the 22nd most-visited website in the category for March, receiving 0.22 percent of visits to the category.

"As online video becomes more mainstream with internet users, the share referred traffic from the younger audiences of social networks is declining, shifting instead toward search," said Heather Dougherty, director of research, Hitwise.

"Integration into search engine result pages through universal and blended search is increasing both the exposure of online videos and the importance of search as a traffic driver in the online video category."

Top Independent Video Sites

Among the highlights:

• Break.com was the most-visited independent online video website in March, receiving 1.82 percent of all US visits to the category.
• MetaCafe received 0.98 percent, followed by Daily Motion with 0.96 percent of visits.
• The "Independent Online Video" category accounted for 0.06 percent of all US Internet visits in March 2008, an increase of 17 percent compared with March 2007.
• The amount of time spent on the websites increased 9 percent for the week ended April 5, 2008 compared with the equivalent week in 2007.