FB/Twitter and HN aren't really comparable here. HN does topic moderation; FB and Twitter do not. There's a lot of room for subtlety here -- you could argue tha

FB/Twitter and HN aren't really comparable here. HN does topic moderation; FB and Twitter do not. There's a lot of room for subtlety here -- you could argue that topic moderation is done in a biased way that ends up behaving like censorship, for example -- but the discussion definitely won't go anywhere if it doesn't make a good faith effort to avoid equating those two things.