Using your cell phone, Telling Friends Where You Are (or Not)

You may not want everyone to know where you are all the time, so here
are many ways your phone can tell a lot of people where you are, and
you choose who, and when the message goes out.

Telling Friends Where You Are (or Not)

Giving people more choices in revealing their locations with their
cellphones is being popularized by the Foursquare service.

http://s.nyt.com/u/2rc