Finding information on the World Wide Web: the retrieval effectiveness of search engines
Information Processing and Management: an International Journal
Discriminating meta-search: a framework for evaluation
Information Processing and Management: an International Journal - Special issue on progress toward digital libraries
Usage patterns of collaborative tagging systems
Journal of Information Science
A study of results overlap and uniqueness among major web search engines
Information Processing and Management: an International Journal
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We consider search engines and collaborative tagging systems from the perspective of resource discovery and re-finding on the Web. We performed repeated searches over nine-months on Google and del.icio.us for web pages related to three topics selected to have different dynamic characteristics. The results show differences in the resources they provide to the searcher. The resources tagged on del.icio.us differ strongly from the top results returned by Google. The results also suggest the changes in the most recently tagged web pages may be associated with the level of activity in user communities and, indirectly, with external events.