A controversial iOS app has promptly been pulled and blocked over major legal and privacy concerns. Girls Around Me (App Store, no longer active) had advertised itself as using Foursquare check-ins and a Facebook sign-in to find nearby women who had recently checked in with publicly visible Facebook profiles. The app not only showed how to find them on Google Maps but encouraged the presumably male users to message and otherwise get in touch with these girls without their knowledge or consent.
