identi.ca is a free personal web server that implements a distributed social networking service. It is based on pump.io, a free software which make up the distributed social network.
Free • Open Source
What is Identi.ca?
identi.ca is an open source social networking and micro-blogging service based on the pump.io software, using the Activity Streams protocol. Identi.ca continues to operate alongside several other pump.io-based hosts provided by E14N which continue to accept new registrations.