Facebook, Comscore | featured news

ComScore and Nielsen are introducing rating systems for Facebook, to help advertisers better compare the social-networking site to traditional advertising outlets such as TV and print.

Facebook is so large that it now accounts for about one out of every three ad impressions in the U.S., according to the latest statistics from comScore Ad Metrix. In the first quarter of 2011, comScore estimates that 1.1 trillion ads were served to U.S. Internet users, and 346 billion of those (or 31 percent) were on Facebook.

U.S. Web surfers are spending more time socializing on Facebook than searching with Google, according to new data from researchers at comScore Inc.

Facebook has more users than ever, says comScore. With its most recent privacy backlash seemingly behind it, Facebook surged ahead to a new traffic record in the U.S. during the month of June. According to comScore, the social network pulled in more than 141 million unique visitors in the U.S. during the month, beating its previous record (set in May) by better than 11 million.

Just last week, Aol celebrated its re-emergence as an independently-traded company. But it's one main advantage is that it still commands a large audience, and in fact was the fourth largest Website in the U.S.—until last month. ComScore data for November, 2009 shows that Facebook surpassed Aol with 102.9 million unique visitors in the U.S., versus 99.7 million for Aol.