OK, so yeah, there’s

https://wikisummaries.org

But it’s neither very good nor comprehensive. I think a user-generated Wiki that’s extremely extensive in its number of entries (like Goodreads) and has deep chapter by chapter break downs, user discussion boards, questions, themes etc. would be extreeeemely useful. I imagine it covering every kind of books: fiction, nonfiction, poetry, etc. or anything with an ISBN#.

I would like this personally because a lot of times I’d like to discuss themes in books that are a bit too obscure to get many replies to on a sub like this. If you are posting directly to the specific book’s wiki page you know you’ll be getting feedback from people also thinking about that book.