11. A method comprising: determining, via one or more computing devices, a tag that is logically related to a particular tag; determining an overlap between items associated with the particular tag and items associated with the logically-related tag; providing an option to enable one or more users to merge the logically-related tag with the particular tag at least partly in response to the determined overlap being greater than a first value but less than a second value; suggesting to the one or more users to merge the logically-related tag with the particular tag at least partly in response to the determined overlap being greater than both the first value and the second value; and merging the logically-related tag with the particular tag at least in part based on user selection of the logically-related tag.
18. A method as recited in claim 11 , further comprising: determining a set of tags that are logically related to the particular tag; and presenting the set of tags to a user to enable the user to vote to merge the particular tag with a tag of the set of logically-related tags.