Org Social is a very peculiar decentralized social network, as it works from text files in Org Mode format. Each user interacts through their own social.org file, which they modify with their favorite editor. In this plain text file, you create posts, participate in conversations, leave comments in groups, react, create polls, vote, and much more. All this without depending on a centralized server, without algorithms deciding what you see, without registration, always with total control of your content.
As an org-mode user and fan of static sites, I find Org Social very interesting