I stumbled across a thread started by Shelley at BurningBird, where she introduces what she calls 'tagback': the creation of a more-or-less unique tag, based on the title of the post (I think). She also prepends a 'bb' to the tag to indicate 'BurningBird'. (For the original post, see Burningbird � Introducing: Tagback).

Needless to say, this is not what I meant by tagback in my recent post on the subject (iTags = Open Tags?). My definition of tagback is much more akin to the meaning of trackback: a blog-program supported ping mechanism, so that one program signals to another a trackback relationship between two posts. In tagback (my version), there is a ping from the taggregation service, like Technorati, to the blog application hosting a tagged blog post.

As I said inthe earlier posts (the earliest on this subject were in the spring, I think), open tagging should include tagback, so that the tagged entries can accumulate a list of those tagspaces where the content is aggregated. How can an author know, at the time of writing, the location of these tagspaces? Sure, you can pick one -- Technorati likes that -- but that's just a de facto tagopoly emerging.