Loopt Mobile Messenger, Friend Finder, and Event Service

http://www.loopt.com/, description via Joe McCarthy


...they already have 40K users, and will be doing a
major launch in December (at which point the application
will be pre-installed on all Boost phones).

...Managing privacy issues will be crucial to their success;
Mark said everything is opt-in, requiring an explicit
invitation, acceptance, and activation, and it only works
if you know someone's phone number."

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