Location based chatting is a privacy nightmare. How do you protect against stalkers using this tool for triangulating the actual physical location of someone?

Location based chatting is a privacy nightmare. How do you protect against stalkers using this tool for triangulating the actual physical location of someone? If the GPS coordinatates are client-generated, then it would be possible to spoof the coordinates and generate a search pattern rather quickly. Competition like grindr and badoo try to randomize the distances.