https://www.discourse.org/ with a discovery mechanism? Would be cool to get Keybase out of Zoom to use for pki identity across various communities. Seems like all the primitives are there, just a lot of grind to do it.
Users->Discovery Mechanism->Topics->Threads with all of the trimmings.
3 different forum softwares are working on ActivityPub support: Discourse (via The Pavilion), Flarum, and nodeBB.
That's cool, will definitely be checking back on it from time to time.