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On its YouTube blog, Google confirmed that it purchased fflick because "the fflick team will help us build features to connect you with the great videos talked about all over the web, and surface the best of those conversations for you to participate in," according to Shiva Rajaraman, the YouTube group product manager who wrote the post.
The entry notes that there are more than 400 tweets per minute containing a YouTube link and that Facebook users watch more than 150 years' worth of YouTube video every day.
Fflick, formed last year by four former Digg employees, analyzes chatter on Twitter to create Rotten Tomatoes-like ratings. It's easy to see how YouTube could adapt the technology to videos that appear on the site.