For ages, whenever you've wanted to use your Facebook credentials to log into a third party app like Foursquare or Candy Crush, you've had to give the app access to any and all data that FB has on you. There's simply been no way of choosing what information you can share--until now. Facebook announced last year that it would be implementing a new API this spring which allows the user, not the developer, to decide what sorts of private information each app is privy to. Well, that year is up and now whenever you "Log In Using Facebook," you'll be redirected to a landing page where you can select which individual data sets you want to share. Only want to tell Groupme your birthday and location? Done. Don't want to give Untappd access to your contacts? Easy.