Did you know that people who have strong social ties tend to live longer than those who don't? Well, thanks to Oprah, now you do!

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O magazine recently teamed up with Skype to create the Just Say Hello campaign, encouraging people to start a conversation with easy, helpful tips from celebs on how to up your social game and increase your lifespan.

What's the best way to combat loneliness? "All it takes is a willingness to reach out," Sanjay Gupta, M.D., explained in the latest issue of The Oprah Magazine. "And it begins with a simple hello."

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If smiling at a tollbooth officer or learning your barista's name is all it takes to lengthen your life, then what are you waiting for?

Seth Rogen, Kelly Ripa, Kerry Washington, Gayle King, Kate Upton and other hot stars have jumped on board to help promote more face-to-face interaction.

Pick up the latest issue of O magazine for more simple tips on starting a fun conversation, and be sure to check out the "Just Say Hello: It's a Powerful Word" video clip above!

When you're done, tell Oprah about a hello you gave or received by posting to Twitter, Facebook, Instagram or Vine using the hashtag #justsayhello.