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The Guardian has an article on tag-based information sharing under the title “Steal this bookmark!” (though I don’t know what tagging has to do with Abbie Hoffmann.) They write about del.icio.us, Flickr and 43 Things, as well as the tag-tracking studies by Technorati. They also make a good job of describing the problems with tags – namely, that they are a complete nightmare to AI researchers who try to fit the whole world into a carefully constructed, strictly hierarchical, redundancy-free and consistent semantic network. On the other hand, tags seem to work, whereas carefully constructed … etc. don’t.