There are tons of active subreddits about specific fiction books, but surprisingly few large subreddits about specific non-fiction books.
I wonder if this is bc you might discuss problems in e.g. Feynman Lectures in /r/physics, but fiction lacks cross-book “home."
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Aren’t there subs for genres such as fantasy?
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There are! But I suspect genre conversation is pretty different in fiction vs. non-fiction. Like, if I write about the Feynman Lectures in /r/physics, anyone can engage, even if they haven’t read it; but the same is probably not true about a fantasy book in /r/fantasy.