There's nothing interesting in any iBeacon sold, they're just (mostly) Nordic 2.4GHz chips in cool package. What matters is the software and related services; in this case Facebook has a chance to make iBeacons actually useful for retailers because they want to make Facebook app itself be able to use beacons to deliver you localized information. With a typical beacons you'd have to install a special app for every store or service that wants to use them.