"Swoogle is a search engine for the Semantic Web on the Web. Swoogle crawl the World Wide Web for a special class of web documents called Semantic Web documents, which are written in RDF."
Discussion of flaws and potential solutions to using social bookmarking sites (from del.icio.us to digg) as folks monetize, abuse, trick, and tweak them: no uniform tagging conventions, flat tag structures (non-relational), overly-generalized tags (catego
E. Oren, M. Volkel, J. Breslin, and S. Decker. Database and Expert Systems Applications, 4080/2006, page 509-518. Springer Berlin / Heidelberg, (September 2006)