It was only a matter of time before someone wrote this program:

Creepy is a software package for Linux or Windows — with a Mac OS X port in the works — that aims to gather public information on a targeted individual via social networking services in order to pinpoint their location. It’s remarkably efficient at its job, even in its current early form, and certainly lives up to its name when you see it in use for the first time.

– Slashdot

Yiannis Kakavas explains why he wrote Creepy.

Kudos to Mister Kakavas for naming his program Creepy: I may not approve of the program, but I respect and appreciate his candor.