This brings to mind a wish that occurred to me as I waited for a BART train in San Francisco. Privacy issues aside, I’d love for my Bluetooth-enabled Sony-Ericsson cellphone to meander the ether consulting the contacts databases of similarly untethered devices in the vicinity.

Cast a net for a set of personal UUIDs (read: telephone numbers). Notify me if anyone within tooth-shot has more than a specified threshhold [sic] of n contacts in common. Offer to broker an introduction.