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I've noticed this happening as well, and the explanation that I've stuck with is that the follow-up posts are posted by readers who recognize a similar article

I've noticed this happening as well, and the explanation that I've stuck with is that the follow-up posts are posted by readers who recognize a similar article they've previously read that's deserving of a (re)post on HN.

detaro 5y ago
That, or they go searching for additional information and find related articles. Another easy one to spot: there's sometimes clusters of articles from the same site if it's not a well-known one - people look around the site, find other good stuff and submit that too.
progfix 5y ago
Sure, but I noticed those similar posts always have the same keywords in them. This time it is "sheds" and I am a little bit in disbelief that someone is gonna post more about sheds :). The first post wasn't even about sheds, it was a question about hobbies. I don't say that this bad or anything, in fact I like that every day has a different topic on the front page. If this is a natural phenomenon then I have not heard about it yet (and it might be interesting to research?).