This only seems useful if it is automated and extremely fast. If you are law enforcement there are faster ways to do this. Like just calling in the city the "ba

This only seems useful if it is automated and extremely fast. If you are law enforcement there are faster ways to do this. Like just calling in the city the "bad" guy last checked in at. And if you aren't, there are much easier ways to get info on the room someone is using, like social engineering. Which I'd actually one if the examples the author gave when he simply asked the victim in twitter what floor he/she was on. I haven't seen criminal scenarios where the bad guy takes a photo if his view or checks in on four square, that doesn't get rounded up fairly quickly.