Facebook is celebrating its 6th birthday in style, with yet another traffic milestone: 400 million users served .
Two months ago the social network hit 350 million , and CEO Mark Zuckerberg reminds us that number was less than half of today’s 400 million mark a year ago.
It took the site about three months to climb from 300 to 350 million users and only about two months to gain another 50 million, indicating...
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