Google hit a new Internet mark in May: Its websites had more than 1 billion unique visitors. No Internet company has ever achieved that, according to a report from comScore.
That number doesn't mean Google searches, although it's no doubt a hefty chunk of the billion; it also includes YouTube (owned by Google) as well as Gmail and other related Google websites.
Second to Google are Microsoft's websites, which had 905 million unique visitors in May, comScore said. (Msnbc.com is a joint venture of Microsoft and NBC Universal.)
Facebook was third, with 714 million users.
ComScore's figures are based on its "global measurement panel" of 2 million Internet users. When the company began measuring unique-visitor traffic to websites five years ago, Google had 496 million unique visitors each month. Microsoft's sites were in the leading position, with 539 million visitors then. And Facebook — well, in 2006, it was mainly a college-oriented website with a kid named Mark Zuckerberg running it.
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