Ask HN: Any online book club for scientific books?

Some books are hard enough that I'd like to be able to discuss them with others, to share ideas, hints for exercices, discuss complex topics etc. Basically a MOOC with a book instead of a teacher. Technically a web forum would do, with one forum per book, where you would be able to find people who are or have been recently reading that book. Couldn't find anything like that, surprisingly. Am I blind?