CNN MONEY - Aug 7 - The new French app keeps a log of all Happn users you cross paths with throughout the day so you can check through the log and get in touch. The potential couple can't communicate unless both people are interested. Happn has already taken off in France, with major growth in other European. It has more than 350K members and 100K daily active users. As with any app that uses geolocation, privacy is a concern. Happn CEO, Didier Rappaport, says that the app doesn't track people and only shares profiles and the approximate location of where paths were crossed. Users can only register for the app using their Facebook accounts to avoid fake accounts.