Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!
Pleroma - Pleroma is a free, federated social networking server built on open protocols.
Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.
GNU social - GNU social is communication software for both public and private communications.
Miataru - be found
ZeroMe - Social network for the distributed P2P network ZeroNet.