Internet Stalking Problems (Foursquare, Twitter, etc.)

Foursquare's Stalker Problem
http://www.thedailybeast.com/blogs-and-stories/2010-08-08/foursquare-and-stalking-is-geotagging-dangerous/

Social networks that broadcast your exact location make it easy for strangers to watch your every move—and become part of your life without you even knowing it...

"I think that a lot of people have drunk the Kool-Aid without actually thinking that hard about" location-based technologies, says Bugbee. "At some point, some tragedy will occur."

This site shows the extent of the problem:
http://icanstalku.com/