It's official. Tumblr has just hit its 10 billionth post. The New York City based startup, is like the FFFFound for the rest of the world.It was reported that as of May 1, 2011, Tumblr included more than 5 billion total posts and over 17.5 million total blogs, which means that Tumblr just doubled its total output in just four months.You can see from Tumblr's homepage and load of falling confetti, that the celebration has begun. Updating, please refresh.

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