Appbout is a PSN over mobile Smart-Phone that lets you create a meeting point where you can find, offer, share anything with people who may have complementary interests to yours.
How to join it to this PSN ?, just download the Appbout free aplication and coming to know people really interesting for you in a public place.
PSN ( Proximity Social Network ) ;-)
This application use GPS in the background. Continued use of GPS running in the background can dramatically decrease battery life.