Build your OWN Apple iBeacon with a Raspberry Pi

iBeacons can be used on apple and android platforms, see here for Pi DIY beacons.
http://www.theregister.co.uk/2013/11/29/feature_diy_apple_ibeacons/

http://smittytone.wordpress.com/2013/12/02/how-to-build-your-own-apple-ibeacon-with-a-raspberry-pi/