imity

Imity is a mobile social network that locates and enables users to send basic profile information to other members' phones via Bluetooth.

Imity is an open-source mobile social networking platform based in Copenhagen. Users can detect nearby members via bluetooth and send basic profile information to their phones. It also keeps track of people on its website, so you can check that out periodically from your normal computer. It bridges mobile and traditional social networks, which may help it gain critical mass.