As a follow up to “On the Subject of Cross Posting”, a question by RJCup3, how should we handle moderation of posts where the bulk (or entirety) of a question has been posted on multiple SE sites?
As far as I can tell, this hasn't been addressed on SPSE meta yet. The closest discussion occurred while the site was still in public beta (Closing crossposts), but that talks more about migrating questions posted to the wrong SE site, rather than multiple SE sites.
I've seen this manifested in both questions and answers on SPSE:
So the question here is how should we moderate questions that are cross posts (either openly or covertly)?
We can not close as duplicate with a link to the cross post, so what should we do?