A report released by comScore Video Metrix service says that almost 178 million US Internet users watched online video in December 2009. The study shows that 33.2 billion videos were watched in the month.

Google Sites are still the top US video property with 13.2 billion videos. 99% of the videos viewed at property were in YouTube. Hulu comes in second with more that a billion video views. Microsoft Sites ranked third with 561 million (1.7 percent), followed by Fox Interactive Media with 551 million (1.7 percent) and Yahoo! Sites with 539 million (1.6 percent). 

Nearly 178 million viewers watched an average of 187 videos per viewer during December. Google Sites attracted 135.8 million unique viewers during the month (97.5 videos per viewer), followed by Yahoo! Sites with 59.8 million viewers (9.0 videos per viewer) and Fox Interactive Media with 56.8 million viewers (9.7 videos per viewer). The average Hulu viewer watched 22.9 videos during the month, representing another all-time high for the property.

In December, Tremor Media ranked as the top video ad network with a potential reach of 103.7 million viewers, or 58.3 percent of the total viewing audience. BBE ranked second with a potential reach of 101.1 million viewers (56.9 percent penetration) followed by Advertising.com Video Network with 83.6 million viewers (47.0 percent).