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^ Heymann, Paul; Paul; Koutrika, Georgia; Garcia-Molina, Hector (February 12, 2008). "Can Social Bookmarking Improve Web Search?". First ACM International Conference on Web Search and. . .
More info on http://www. searchenginejournal. com/125-social-bookmarking-sites-importance-of-user-generated-tags-votes-and-links/6066/