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Who tweeted it: Justin Bieber or Katy Perry?

ROAR! In a major upset, Katy Perry passed Justin Bieber this week as the most followed person on Twitter. (Mazel tov, Katy!) But can you tell the difference between Twitter's two most popular tweeters? Take our quiz to find out who tweeted the following messages:

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Image Credit: getty images

Question 1 of 16


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