According to comScore March 2010 Video Metrix data “more than 180 million U.S. Internet users watched online video during the month. YouTube delivered video to more than 135 million viewers during the month.” U.S. Internet users watched 31.2 billion videos in March, with Google Sites ranking as top video property with 13.1 billion (41.8%) videos viewed online. YouTube accounted the vast majority of videos viewed at the property. Hulu ranked second with 1.1 billion (3.4%), Microsoft Sites ranked third with 655 million (2.1%), followed by Yahoo! Sites with 478 million (1.5%) and CBS Interactive with 457 million (1.5%).