Can you believe Twitter is seven years old already?

OK! News: The Best Celebrity Tweets of 2012

Since it began, Twitter has changed how celebrities communicate—for better and worse. Check out my selection of seven tweets to celebrate seven years, and make sure to follow us on Twitter @OKMagazine!

Watch: Nicki Minaj Has a Major Wardrobe Malfunction

Twitter founder Jack Dorsey sent the very first tweet ever back on March 21, 2006.

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