Facebook is well on its way to taking Yahoo’s spot as the third largest Web property in the world. (Google and Microsoft are No. 1 and No. 2, respectively). Last summer Facebook took the No. 4 spot globally, displacing AOL, but according to comScore there was still an estimated 241 million unique visitors a month separating it from the No. 3 site, Yahoo. In December, 2009, that gap narrowed to 125 million unique visitors globally. (That was also the same month Facebook passed AOL in the U.S. to take the No. 4 spot domestically).

In December, 2009, Facebook attracted 469 million unique visitors, up an incredible 31 million visitors from the month before. To put that in perspective, in a single month Facebook gained as many new visitors as Yahoo did all year. That one-month gain was also the equivalent of adding as many people as all of Digg or half of Twitter.com. Meanwhile, Yahoo lost 7 million unique visitors from November to December to end the year at 594 million unique visitors. (In the U.S., Yahoo is a stronger No. 2 after Google, with 161 million uniques in December, compared to 173 million for Google, 138 million for Microsoft, and 112 Million for Facebook).

These numbers are different than the 350 million registered users Facebook itself counts, half of which come every day. ComScore estimates total traffic, which is larger than the number of reported registered users (you don’t have to be a Facebook member to visit a public page). And these are estimates, remember that. And they don’t include the 60 million people a month who log into other sites via Facebook Connect.

Read:: http://www.techcrunch.com/2010/02/01/facebook-yahoo-bigger-pageviews-comscore/