It seems as though there are a lot of redundant tags. For instance, over on ~creative, there have been posts submitted with the tags of poetry, poems, and poem, many of them with multiple of these tags. This seems to subvert the purpose of the tagging system; if I want to look at, say, all poetry-related posts (or, on the other hand, to exclude them), I have to imagine all the possible ways to mention poetry. In most cases, there will be only a few (like in this case, 3), but it still is redundant and adds friction and seems kind of pointless. What, if anything, should be done about them? Can we make a user-based system to 'merge' tags, where we choose one of them to be canonical—for instance, 'poetry'—and when a user tries to add a tag that has been declared a synonym, it is replaced with its canonical counterpart?