Facebook is best known for the networking side of its social site, but increasingly its video advertisement is performing very well. This is due to social games, using virtual currencies and Zynga.
A recent study by TubeMogul, the online video distribution, ad and analytics platform found that Facebook attracts some of the most engaged viewers online." This statement is backed up by Facebook users having the most minutes watched per view. A Facebook viewer will spend 1:45 minutes watching an ad, where a a viewer on Bing will give the ad 1:16 before they go elsewhere. Google (1:32) and Twitter are both behind Facebook in the amount of time spent watching video ads.
One of the reasons for the success of Facebook in video advertising, as stated earlier, is the success of social games. The social game Farmville accounts for 100 million unique users. This figure can give you an understanding of how big the potential audience is for video advertising on Facebook.