Article: Study: Search Engines Have Indexed Less Than Half the Web.

By Rachel Chalmers

A new study suggests that the leading search engines taken together have indexed less than half the pages published on the world wide web. It also appears that search engines do not treat all sites equally, and that new pages may not appear on any search engine for months. In an article published this week in Nature, Steve Lawrence and C. Lee Giles of the NEC Research Institute in Princeton, New Jersey observe that the web is becoming a major communications medium. They call for the data on it to be made more accessible.

Lawrence and Giles have estimated that the web now contains around 800 million pages. That's 6 terabytes of ...

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