Some years ago, Yale psychologist, Stanley Milgram introduced the idea of the 'familiar stranger.' Familiar strangers are those people that you see often but don't know--the woman who's always at your bus stop in the morning, the man who shops at the grocery store early Saturday morning when you do.

Mark Frauenfelder writes about Jabberwocky an application that uses Bluetooth to track familiar strangers.

I'm not completely sure what the application is for all this. For one thing, familiar strangers ought to be people that you see (how else do they become familiar) not so much people you don't see but who are around all the time. But it's interesting nonetheless.