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Facebook Bluetooth Beacon
Facebook Bluetooth Beacon is free and allows local businesses to communicate with customers near their restaurant? Facebook is using beacons to show location 'tips' from restaurant Facebook Pages. This new feature sends location tips to a users feed using GPS, Wi-Fi and Bluetooth beacons. This is a new way Faceboook found to track the location of a user beyond GPS and Wi-Fi. The social network is using Bluetooth beacons in some businesses to send location-specific tips to your phone, all the while crushing any hope Foursquare had left for relevance.
This is a video with more info https://youtu.be/2d8Iw-Bn7tI
This article describes how it works: http://www.cnet.com/news/facebook-using-beacons-to-show-location-tips/