Too easy...
Look into Dating type sites. I predict in the future PDA's and the likes of Geo locational gizmos will certainly help people "Hook-up".
Some basic experiments been done with devices that could detect proximity with sonsor's on a device. Its very rudimentary though but with a device able to access a DB of info to detect compatibilty, availability etc, notice can be givin about the possible compatibility complete with picture or other info depending on security settings of your device.
Once 2 "Compatible" people come near one another the people are notified.
However to extrapulate on the idea I think it would certainly be useful even for business development where representives of companies may wear and item and be able to post what he is looking for in his business from day to day month to month etc.
You never ever know that an opportunity literally can just walk by you in public or within Industry. With similer devices as above a message could be sent and a business opportinity may stem from that event.
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