The world of internet would be a _much_ better place if everyone at least have read this. I tried my best to adhere to these rules in any social network.
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It doesn't really depend on whether I think someone's trolling, because the response is usually much the same in either case and anyhow genuine trolling (i.e. totally bad-faith action to provoke or waste time) is relatively rare.
I have no desire to take HN "offline" and pollute my inbox/outbox with a bunch of moderation notes. That's too annoying.
It might be slightly better if every submission and comment had a mailto: that automatically populated a new email with a link, but even then, this shouldn't be necessary.