We have seen all kinds of bluetooth marketing/advertising systems in the last two years. The concept that they used was simple: whenever a device is closeby, push ad matereal into in ruthlessly.
A college group has now taken a different approach. Their display looks at closeby bluetooth devices and stores their data in its internal database. This data is then used to show ads on a screen – each user thus gets to see each ad only once.
In fact, a small-scale test installation is already up and running:
If you ask me, the main problem here is trackability. The ad display manager can know which Bluetooth device ID was here and when – another step away from anonymity and another reason to disable bluetooth on your PDA….