What uses does iBeacon have outside of Apple Stores?

While Apple’s iBeacon was designed to improve the customer experience at Apple stores, more and more companies are using the device for their own purposes. 

Apple flipped a switch and enabled customers at 254 U.S. stores this week to get spammed with micro-location based promotional nagging. iBeacon is a very low cost, low-energy way to achieve actionable “indoor GPS” in which “beacons” use Bluetooth Low Energy (BLE) signals to figure out exactly where you are and send messages relevant to that specific location.