As of right now, Plasma Bigscreen isn't available for public use yet. This is due to not being developed for so long. The project has been revived, but it might take a while until it becomes stable and is available for public use.
Trocken (Sober) by Daniel Wagner. Written in german, I don't know if there's an english translation. It's about himself struggling with heavy alcoholism and his way out of the addiction.
Threadiverse is a term for Fediverse platforms that provide threaded conversations, like Lemmy, PieFed, Mbin, NodeBB. The term was used before Meta's Threads was a thing.
https://meshmap.net/, but you have to opt-in for your node to show up there. There are ~20 nodes in my vicinity, but only 5 of them are on meshmap.