The rise of mobile social networks is inextricably linked with the revolution in mobile computing, which has spawned a huge industry in mobile application development. Localization techniques such as GPS (Global Positioning System), has made it possible to share the location information on mobile social networks. Positioning technologies such as wireless localization techniques and global positioning system gives rise to location-aware social networks. But the location data posted to social networks are revealing sources, too. Hence friending has become the challenging part of mobile social networks.