I just remarked this here: Exact times of answer posts. The question got closed as duplicate. Looking at the Related list shortly after, most of the posts there are either duplicates, or speak about duplicates:

I think the algorithm which searches related questions should exclude the text Possible duplicate for the comparison.

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    Those questions are related to the original post because the original post has the [duplicate-answers] tag on it, not because it is identifying "Possible Duplicate" as similar text. – user102937 Aug 1 '11 at 22:17
  • Ah, good point. I think I can close this question, then. – Paŭlo Ebermann Aug 1 '11 at 22:20