What is Brightkite?
Location-based social networking
Discover who visits your favorite places. Join the community in real time.
Track your friends
See where your friends are and what they're up to, in real time.
Meet people around you
Meet real world friends. Reveal your location, befriend, and chat with people around you.
The service, a device agnostic, SMS-based application, lets you "check in" at various locations out in the real world and then see who else is there, has been there, and who is nearby. You can check in via text or via the web, but text is easiest if you're mobile.