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Justin Bieber tops Lady Gaga to rule Twitter

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Justin Bieber performs at the Jingle Ball 2012 in Atlanta, Georgia December 12, 2012. REUTERS/Tami Chappell/Files

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Lady Gaga performs onstage during the Rolling Stones final concert of their "50 and Counting Tour" in Newark, New Jersey, December 15, 2012. REUTERS/Carlo Allegri/Files

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