Duplicates are generally accepted when there was no significant discussion on the original submission.

denysvitali 12 hours ago | parent | next [-]

I seem to remember there's a system in place to prevent duplicates (where the submission of a duplicate link results in the upvote of the original story), but maybe that's limited to the first 24h? Idk, HN works in mysterious ways

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kvemkon 13 hours ago | parent | prev [-]

This has negative impact on searching older discussions. Instead of 1 result for 1 URL (within few month) getting 2 or even more.

	▲	tptacek 13 hours ago \| parent [-]
		It's a settled enough part of HN that you'd do better emailing hn@ycombinator.com about it than you will litigating it in public. I don't care either way, I'm just explaining the behavior to you.