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The global rise of Facebook is nothing less than astounding. In the month of June alone it gained 24 million unique visitors worldwide, compared to the month before, for a total of 340 million unique visitors worldwide. It is now the fourth largest site in the world, trailing only Google, Microsoft, and Yahoo sites, according to comScore (see table below). Facebook itself only officially acknowledges 250 million active registered users (but you don’t have to be a registered user to visit some Facebook pages).