80
      Tuesday
      93 / 75
      Wednesday
      91 / 74
      Thursday
      91 / 73

      Justin Bieber vs. Lady Gaga

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      Social media is one way to measure the popularity of a celebrity... and now there's a new top dog!

      Justin Bieber surpassed fellow singer Lady Gaga Monday night to become the most-followed person on Twitter.

      Both have more than 33.3 million followers, but Bieber is just a little bit ahead of Gaga now.

      Neither immediately acknowledged the milestone.

      Gaga held the top spot since August 2010, when she overtook another well known singer... Britney Spears.

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