Apart from https://gnu.io/social/ https://gnu.io/social/ and http://pump.io/ http://pump.io/ which have already been mentioned, I have a soft spot for https://p

Apart from https://gnu.io/social/ https://gnu.io/social/ and http://pump.io/ http://pump.io/ which have already been mentioned, I have a soft spot for https://project.jappix.com/features https://project.jappix.com/features and https://movim.eu/en https://movim.eu/en because of their use of XMPP pubsub which I believe to be the ideal infrastructure for decentralized microblogging. But for lack of large entities pouring tides of promotion money into them, they all have small populations.