HERALDSUN.COM.AU - June 25 - Dating site Happn has 290K users in Australia and 19M globally. The app keeps track of a person's movements to within a 250m radius of each other so there are serious concerns the app could be a stalker's paradise. Happn's head of trends, Marie Cosnard said the "privacy and security" of users was critical when the app was created. "It never shows anyone's exact location," she said. "Happn doesn't record the exact journeys of users either, we just register the crossing points."