I did read [a very similar question to this one][1] but found it confusing, and it was more about when this site was in beta. 

I just flagged a question that was, arguably, an exact duplicate of a stack overflow question. 

For a question that is an exact duplicate, what are non-moderators expected to do? The site won't allow it to be given a close vote unless it duplicates a programmers question, which perhaps I should take as a hint. 

Should such questions be flagged as possible merge candidates (though which direction the merge goes would presumably depend on the questions)? Should we just let a thousand flowers bloom? If such duplication is considered fine I don't want to waste moderator's time by flagging them.


 [1]: http://meta.programmers.stackexchange.com/questions/162/how-do-you-deal-with-famous-questions-of-stack-overflow-that-are-being-asked-aga