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And an HN comment is not a scientific paper. When I tell people about ideas I find insightful, I don't cite a proper source either. If they like the idea I might tell them later, how I got it or where they can find more detail about the idea.

Honestly quite often an idea did originate in my own thoughts, but the work to put it into well-formed words, which I will use to tell others about it, was done by someone else, whose formulations of the same idea I had, I have read later.