> **Possible Duplicate:**  
> [Is it okay to inform users to stop promoting Apple.SE when a question is fine to stay here?](http://meta.superuser.com/questions/2967/is-it-okay-to-inform-users-to-stop-promoting-apple-se-when-a-question-is-fine-to)  

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I read [this question](http://meta.superuser.com/questions/2726/users-asking-ubuntu-questions-should-be-informed-about-askubuntu), which helped, but where is the line?

Just because a question is about an Apple product, doesn't mean it is off-topic (not at all actually) just because another (more specific) site exists for that kind of question.  
Then again, a question that would be *more at home* on another SE site is bound to be duplicated on that site at some point and duplication sucks.

I feels like, generally, the opinion seems to be to keep the question on SU.  
But when should it be marked off-topic then? There has to be a certain point where it is no longer SU material, but AskUbuntu material.