Sneakpeek lets you attach your online persona to your offline self.
People who dont know you follow/like/view you online all the time. People that you see around you cant do that and you cant do that either. Basically, if you wish to be identifiable offline, you should be.
Visibility range is about 100 feet. It is built using Bluetooth Low Energy that has no measurable impact on battery life.
Requires iPhone 4s or newer, iPod touch(5th generation), iPad 3 or newer, iPad mini or newer.