JeeNet is an open API shared content framework that links users and content. Its structure is best described as forum’s structure, so it has: catalogs, forums, topics and posts. The type of content (in posts) it supports are as follows: text messages and media types - from images and video to user manually specified content. [...]

Overblue is bluetooth P2P program for Android platform. It creates bluetooth network between its users and allows them to chat and to share/download/send files (social stuff pending). Resulting network can be of any size, number of simultaneously connected users is not limited (though 100 is estimated as reasonable maximum).