When we spot a duplicate question, what is the best way to handle it?
Of course if we have a huge reputation, we can just do it, but when we don't have enough reputation we should have ways to notify peers that this question should be reviewed.
So how to proceed, do we add a tag "possible-duplicates" that could be searched for more easily? The drawback of this is that you still need enough reputation to be able to retag a question. So do you have better ideas?