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Facebook has enough information to build that app. They may well have something like it internally.
( , Mon 22 Apr 2013, 9:21, Reply)
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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)
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I'm not personally scared of it: I don't have a Facebook account....
( , Mon 22 Apr 2013, 9:29, Reply)
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I actually think it's a good idea.
( , Fri 26 Apr 2013, 15:26, Reply)