Friendica - Decentralisation - Privacy - Interoperability
GNU social - GNU social is communication software for both public and private communications.
Known - Publish blog posts, photos and media to your own site, and syndicate it to your social networks. Keep everything on your own site.
Gab - Gab is an ad-free social network dedicated to free speech.
Pleroma - Pleroma is a free, federated social networking server built on open protocols.
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.