Facebook has enough information to build that app. They may well have something like it internally.
(, Mon 22 Apr 2013, 9:21, Reply)
Oh, and look what someone just told me about: www.cultofmac.com/157641/this-creepy-app-isnt-just-stalking-women-without-their-knowledge-its-a-wake-up-call-about-facebook-privacy/
(, Mon 22 Apr 2013, 9:23, Reply)
I'm not personally scared of it: I don't have a Facebook account....
(, Mon 22 Apr 2013, 9:29, Reply)
I actually think it's a good idea.
(, Fri 26 Apr 2013, 15:26, Reply)