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.
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