Did you know one word has the power to make you live longer? We're partnering with Skype to improve the world—and your health—one new friend at a time. Watch as Oprah, Gayle, Jimmy Kimmel, Julia Roberts and others help us combat loneliness and demonstrate how a small gesture can make a big difference. Then, tell us about a hello you gave or received by posting to Twitter, Facebook, Instagram, or Vine using the hashtag #JustSayHello.
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