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Directories use an indexing strategy that makes them distinct from other search tools. They use real live people to search the Web, and to review and categorize the sites by topic. This reduces some of the aggravations that frequently plague the researcher, such as duplication of listings, broken links and out-of-date information. A perfect choice when you have very little idea what is out there, directories are set up to satisfy expert and inexperienced users alike. This is why Yahoo!, one of the pioneer directory sites, is consistently ranked number one in Internet polls.