Ur en artikel från år 2000, på söktemat "Deep Web Size":
The surface Web contains an estimated 2.5 billion documents, growing at a rate of 7.5 million documents per day.(5a) The largest search engines have done an impressive job in extending their reach, though Web growth itself has exceeded the crawling ability of search engines(6a)(7a) Today, the three largest search engines in terms of internally reported documents indexed are Google with 1.35 billion documents (500 million available to most searches),(8) Fast, with 575 million documents (9) and Northern Light with 327 million documents.
The value of deep Web content is
immeasurable. With this in mind, BrightPlanet has quantified the size and relevancy of the deep Web in a study based on data collected between March 13 and 30, 2000. Our key findings include:
* Public information on the deep Web is currently 400 to 550 times larger than the commonly defined World Wide Web.
* The deep Web contains 7,500 terabytes of information compared to nineteen terabytes of information in the surface Web.
* The deep Web contains nearly 550 billion individual documents compared to the one billion of the surface Web.
* More than 200,000 deep Web sites presently exist.
* Sixty of the largest deep-Web sites collectively contain about 750 terabytes of information -- sufficient by themselves to exceed the size of the surface Web forty times.
* On average, deep Web sites receive fifty per cent greater monthly traffic than surface sites and are more highly linked to than surface sites; however, the typical (median) deep Web site is not well known to the Internet-searching public.
* The deep Web is the largest growing category of new information on the Internet.
* Deep Web sites tend to be narrower, with deeper content, than conventional surface sites.
* Total quality content of the deep Web is 1,000 to 2,000 times greater than that of the surface Web.
* Deep Web content is highly relevant to every information need, market, and domain.
* More than half of the deep Web content resides in topic-specific databases.
* A full ninety-five per cent of the deep Web is publicly accessible information -- not subject to fees or subscriptions.
http://www.press.umich.edu/jep/07-01/bergman.html
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