That page was abnormally popular yesterday. Got a contribution for #Tokumei from author @KeeferRourke@twitter.com http://sobac.com/wiki/index.php/List_of_Free_Software_Social_Media_platforms
#Mastodon added: http://sobac.com/wiki/index.php/List_of_Free_Software_Social_Media_platforms Could really use some help with the Connectivity Matrix, tho.
@wg@gnusocial.no I'm collecting a list of !FS social media applications at http://sobac.com/wiki/index.php/List_of_Free_Software_Social_Media_platforms
Werner Koch's talk led me to https://briarproject.org/ , "Peer-to-peer encrypted messaging and forums". Have added #Briar to http://sobac.com/wiki/index.php/List_of_Free_Software_Social_Media_platforms
OK, I've wasted enough time on this: http://sobac.com/wiki/index.php/List_of_Free_Software_Social_Media_platforms (but anybody care to correct/update/expand it?)