Joe from that writup -

''Notably, the signals broadcast by any iBeacon-compatible radio (which broadcast signals known as Bluetooth Low Energy) ''

Lookout Estimote!

Nunchi - System and method for managing mobile communications
US 8311522 B1

''While not shown, in other aspects of the invention, the social statistics sensors can include local network/data logging which records the network available through the course of a day. Such logging could include detection of Near Field Communication (NFC), Bluetooth, WiFi or other short range communication networks. In this way, a social signature might become associated with specific mobile devices and networks in particular locations and times in order to help identify that, when these combinations of networks are detected, a particular social template is to be used. For instance, if one of the detected mobile devices corresponds to logging associated with a particular friend, one social template might be chosen in preference to another social template which might be more willing to allow communication if the user is sensed to be alone.''

emit...