Diaspora

Diaspora* is a name shared by a FLOSS decentralized social network software and decentralized social network based on pods running the diaspora software..

Diaspora* is

• The software licensed under AGPL and is written in coder friendly w:Ruby (language) and uses the w:Ruby on Rails development framework
• The social network with about 400,000 users as of June 2013
• The Diaspora Foundation Wiki oddly no Foundation named Diaspora Foundation exists yet.