This is less of an issue in highly dense urban areas, such as typical east-asian metropolises. If you live in a building with 2000 other people, it becomes less

This is less of an issue in highly dense urban areas, such as typical east-asian metropolises. If you live in a building with 2000 other people, it becomes less concerning. It seems like it would be rather easy to create an automated tool for triangulating users locations; by spoofing the GPS location of ones phone say 33 times, it should be very easy to triangulate every single person in the 'nearby' section.