Comscore | featured news

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.

LinkedIn has hit 50 million users, according to a blog post today, growing from 45 million users two months ago. And according to the latest comScore data, LinkedIn is steadily growing in terms of unique visitors.