Ask HN: For people who've gone viral] which channels lead to virality?

I imagine anyone who publishes stuff on the web is thinking 'I know my stuff's good, if only I could go viral once...'

So - if you have gone viral, which channels sparked it off? X, LinkedIn, Hacker News, Reddit, something else? How did you do it?

And, bonus points, which channels reward quality instead of tricking algorithms with slop?