Some people here are familiar with Activitypub, a decentralized social network with 3,500,000+ users. A friend of mine made a new interface for Mastodon/Pleroma (popular Activitypub applications) that looks like 4chan. I think it's a cute little hack because most Activitypub implementations look like Twitter clones.
Source code: https://ayanami.ga/fedichan/code.html
(Note: I'm not the author; that would be @daisuke@stereophonic.space )