OSN: A distributed social network with an open protocol

OSN is a distributed social network with an open protocol. From a user's perspective, all the individual sites in the federation appear as one. Users can search, browse profiles, send messages, and link to each other without regard to which sites other users are using. Public key cryptography is used to make the system resilient to spam. User profiles are based on the FOAF XML file format and users can migrate their profiles from one site to another.

[License]		Affero General Public License
[Operating System]		POSIX :: Linux
[Programming Language]		C, PHP
[Topic]		Communications