Facebook Monthly Visitors More than Double MySpace, Twitter Combined

As of May 2011, the number of unique US visitors to Facebook.com was roughly 2.5 times the combined number of unique visitors to MySpace and Twitter.com, according to a July 2011 white paper from comScore. Data from “The Power of Like” indicates in May 2011, Facebook had almost 160 million unique US visitors, while MySpace has a little less than 40 million and Twitter had a little more than 20 million.
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