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.