Cross-posting refers to posting the same question on multiple websites.

Cross-posting refers to posting the same question on multiple websites. Cross-posting is frowned upon as it leads to fragmented answers splattered all over the network. If you spot a user cross-posting, please consider politely explaining to them in a comment why we dislike cross-posting.

Refer to the cross-posting FAQ for more details and discussion:

this can be OK, so long as the question is tailored to each audience on the different sites and is materially different in each case. Just to be 100% clear, copy-pasting a question across sites with no changes is considered abusive behavior. – Jeff Atwood♦ Jan 15 '11

See also: Check to make sure a duplicate does not exist before migrating

A migration will be rejected if...

  • ...An exact, word-for-word duplicate already exists on the destination site, or...
  • ...A question created within a week of the one being migrated exists on the destination site with the same author and very similar body text.

Moderators can override this restriction...

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