@lemmyreader Here's a starting point for a fediverse StackExchange: Make sure it's interoperable with Lemmy.
Now, you may not get the full feature set on Lemmy, but you should be able to interact with it from Lemmy as if it's a group on there.
Yep! It seems a good Threadiverse ecosystem could be on its way with lemmy etc, nodebb and discourse. Hooking a stack overflow alternative into that could make a lot of sense of kick starting it.
Though at some point UI differences could prove problematic(?)