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Hé did you see Meetro? I did not. Trendcentral says:

"Meetro utilizes GPS to connect users in close proximity. After signing on and
entering a location, users within the area show up onscreen, complete with name
and photo. Users can read profile info, chat via IM, and make plans to meet up
at a location close by."

Hmm. Must dive into this later. Nice screencast tutorial on the homepage they have.