I couldn't find an answer to my question, concerning not the module itself but the tags created with it.

My users can describe themselves via tags, and a list of all users can be filtered by these tags. Unfortunately, if a user deletes or changes a beforehand entered tag, this firstly entered term remains in the vocabulary - and thus in the list of tags to filter the profiles, with no hits corresponding ...

I would like to generate a list, e.g. with views, to show up all NOT-assigned (orhaned) tags. While I can perfectly create a display to show up "all taxonomy terms associated with a user", I would, in my case, rather need a display to show up "all taxonomy terms associated with NO users".

I already considered the module Orphaned Terms (http://drupal.org/project/delete_orphaned_terms), because my request not necessarily belongs to User Terms. But Orphaned Terms works with the table term_node, not with the table term_user as User Terms does.

Any ideas?