As we get more and more questions in Stack Overflow, the issue of duplicate questions becomes more pressing. The odds of any question being a duplicate, however small, increases with the total number of questions in the system. So it’s worth considering: what makes a question an exact duplicate? As I see it, there are three classes of duplicate questions, from most clear to least clear.
The impending launch of the serverfault.com private beta has interrupted work on this slightly, but better handling of accidental duplicate questions is currently very high on our priority list. We’d like to streamline this so it’s easier, with a friendly UI. (If you have ideas about what UI makes sense in this scenario, we’d love to hear it.) That said, we have implemented a moderator level function to merge duplicate questions — so if we determine two questions are accidental duplicates, we can merge them together without losing anything except the text of one of the questions; all comments and answers are preserved. …