%0 Conference Paper
%1 brooks2006improved
%A Brooks, Christopher H.
%A Montanez, Nancy
%B WWW '06: Proceedings of the 15th international conference on World Wide Web
%C New York, NY, USA
%D 2006
%I ACM Press
%K automated_annotation technorati tagging closely_related diploma_thesis blog clustering ol_web2.0 methods_concepthierarchy methods_concepts
%P 625--632
%T Improved annotation of the blogosphere via autotagging and hierarchical clustering
%U http://www2006.org/programme/item.php?id=583
%X Tags have recently become popular as a means of annotating and organizing Web pages and blog entries. Advocates of tagging argue that the use of tags produces a 'folksonomy', a system in which the meaning of a tag is determined by its use among the community as a whole. We analyze the effectiveness of tags for classifying blog entries by gathering the top 350 tags from Technorati and measuring the similarity of all articles that share a tag. We find that tags are useful for grouping articles into broad categories, but less effective in indicating the particular content of an article. We then show that automatically extracting words deemed to be highly relevant can produce a more focused categorization of articles. We also show that clustering algorithms can be used to reconstruct a topical hierarchy among tags, and suggest that these approaches may be used to address some of the weaknesses in current tagging systems.