I can confirm that the 1984 Threads movie is pretty traumatizing. Not in a horror movie kind of way, in a “this is realistically what would happen in and after a nuclear war, which is the end of everything in the worst way you can imagine” kinda way.

It’s on youtube.

Friendica does. It has a UI that is reminiscent of how facebook used to look. https://venera.social is the instance I use but FediDB has more.

The indentation is a bit too subtle but it’s there.