In the month of July, according to the latest estimates from comScore, Facebook attracted 87.7 million unique visitors in the U.S., which was 14 percent higher than in June, 2009. Twitter, in contrast, only saw 21.2 million unique U.S. visitors to its Website, a 6 percent rise compared to the month before. In absolute terms, Facebook added about ten million new visitors in the month of July versus roughly one million new visitors for Twitter.
At 87.7 million uniques, Facebook moves from the sixth largest Web media property in the U.S. to the fifth, passing the combined sites of Fox Interactive Media (80.9 million uniques) and coming within striking range of AOL (104.8 million). That is just in the U.S. Facebook is already the fourth largest site in the world (and Twitter is doing better worldwide as well, with a total of 44.5 million unique visitors in June).
Note that these estimates are only for Twitter.com and do not include mobile or desktop clients such as Tweetdeck, Seesmic, or Tweetie, but it should be a good proxy for overall growth. Even if you double the numbers for Twitter, Facebook still trounced it in July (and the Facebook numbers don’t include activity on other sites other apps via Facebook Connect either).
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