Robert Downey Jr. Says, "Talk to me, Twitter."

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After finally joining Twitter, the Iron Man star generated more than 55,000 followers after his first tweet.

Miley Cyrus Slams Katy Perry on Twitter After her Tongue Kissing Joke

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After Katy Perry recently commented jokingly in an interview about her recent kiss with the controversial pop star, Miley snapped back on Twitter, referencing Perry's ex-boyfriend John Mayer and all of his previous relationships.