Uh oh: "Fitness trackers work best when they mess with your psychology the way social networks do"

  • rojo
    cofounder
  • Add Letsrun notifications please
  • rojo
    cofounder
  • moist
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  • over sensitive
  • Oh Please
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  • moist
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  • Ren Sen Adios
  • Solution
  • Like being brainwashed.....
  • be a C.Y.N.I.C.
  • entertainedin
  • Glistening Glans
  • pr100
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  • MashaIvanova
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