Girls Around Me was a Foursquare app. And in any case, it only used public information. Facebook offers finely grained privacy controls that allow you to control what third parties can and cannot access- they do a far better job of it than Apple and Google do, IMO.
Obviously, illegitimate access is an entirely different topic.
My understanding was that Girls Around Me used Foursquare to identify people, then connected to Facebook for information such as pictures, interests, etc.
And yes, it "only" used public information. But Facebook has pushed people to make more public than they would really be comfortable being known by the creep who is trying to figure out the right pickup strategy to use.
Obviously, illegitimate access is an entirely different topic.