http://www.theglobalsquare.org is being developed as a new project for social interaction for positive change. They list a copuple of similar projects:

SocialSwarm ( http://socialswarm.net and http://wiki.socialswarm.net ) - Aims to foster collaboration/interoperation between decentralized social networking projects

Lorea ( https://n-1.cc/pg/groups/7826/lorea/ )

Tribler? ( http://www.tribler.org/ )

Pangaia (http://pangaia.sf.net/) - Web 3d, voting model with multi-level federation

Retroshare? (http://retroshare.sourceforge.net/ ) - a F2F software.

Forest (https://github.com/le-moulin-studio/forest) - Platform which provides a secure communication channel over a reusable F2F network of users to third party applications.

Magna? ( http://gitorious.org/magna )

Scope2? ( http://code.google.com/p/scope2/ )

Diaspora ( http://joindiaspora.com )

Project Tyler? ( http://www.youtube.com/watch?v=EGxDqpOxDkw )

Peerson? ( http://www.peerson.net/ )

Federated General Assembly ( http://p2pfoundation.net/Federated_General_Assembly ) ( http://projects.occupy.net/projects/fga )

Friendica ( http://friendica.com/ )

PSYC ( http://about.psyc.eu/ ) & SecureShare ( http://secushare.org/ )

FreedomBox ( https://www.freedomboxfoundation.org/ )

Kune ( http://kune.ourproject.org/ )