Pity the suffering introvert who stands alone in a room full of strangers. Where's a good wingman when you need one? Talk to me, Goose! Don't let this happen to you. Get Sonar (free), an app that helps you find friends nearby. When you find yourself alone, just fire up the app, sign in via Facebook or Foursquare, and see friends on your social networks (Facebook, LinkedIn, Twitter) who are physically around you.