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First thing I thought off. It means the application you are logging into does not know who you are but Facebook does get to know you are logging into that app.

• onion2k 12y ago
  Whichever way you look at it your privacy is better protected if one party knows rather than both parties knowing, so this is definitely a win if you already use Facebook. If you don't then the new option is irrelevant.
  • poppup 12y ago
    Facebook's pitch is to developers, not users.
    • Tepix 12y ago
      Some users will think they remain anonymous when in fact they are authenticated to Facebook.