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This question already has an answer here:

There have been many questions that ask if a user is allowed to cross-post a question on multiple sites, and the general conclusion is that they are not allowed to do so. However, sometimes there are questions which are asked on multiple sites by different users not knowing another SE site had an answer already, where it is on topic on both sites, that have some overlap. What is the policy for such questions? Should they be closed on one site, migrated, or is each site independent enough to allow the question to remain on both sites?

marked as duplicate by Gilles 'SO- stop being evil', Danubian Sailor, Martijn Pieters, ben is uǝq backwards, Flyk Feb 16 '14 at 0:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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If not cross posted and are in fact on topic on the site they are posted on:

Leave them be. No need to do anything.

  • If you're feeling generous, you might leave a comment with a link to the question on the other site. It's possible that the question there got better answers/is phrased more clearly/etc. – ale Sep 5 '13 at 15:17
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Each SE site is its own island, to an extent. Sure, the rules are pretty much the same, but you will get a different group of answers from one group compared to another. Furthermore, it seems unlikely that a new user will have the complete knowledge about every Stack Exchange site. It would be too much to ask for them to have such knowledge.

Furthermore, you can always link to other questions and answers, in the same way that one would link to Wikipedia.

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