Google Sites once again ranked as the top U.S. video property in December with 3.3 billion videos viewed (32.6 percent share of videos), gaining 1.3 share points versus the previous month. YouTube.com accounted for more than 97 percent of all videos viewed at the property. Fox Interactive Media ranked second with 358 million (3.5 percent), followed by Yahoo! Sites with 340 million (3.4 percent) and Viacom Digital with 238 million (2.3 percent).
In total, nearly 141 million Americans viewed online video in December. Google Sites also captured the largest online video audience with 79 million unique viewers, followed by Fox Interactive Media with 43.9 million and Yahoo! Sites with 38.2 million.
Source: comScore Video Metrix : http://www.comscore.com