By Gary Price
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Additional resources for The Invisible Web: Uncovering Information Sources Search Engines Can not See
Link checking is an important part of keeping a directory up to date, but not all directories do a good job of frequently verifying the links in the collection. Directories are also vulnerable to “bait and switch” tactics by Webmasters. Such tactics are generally used only when a site stands no chance of being included in a directory because its content violates the directory’s editorial policy. Adult sites often use this tactic, for example, by submitting a bogus “family friendly” site, which is evaluated by editors.
If an undirected path exists (meaning that links can be followed forward or backward, a technique available to search engine spiders but not to a person using a Web browser), its average length is about six degrees. • More than 90 percent of all pages on the Web are reachable from one another by following either forward or backward links. This is good news for search engines attempting to create comprehensive indexes of the Web. These findings suggest that efficient crawling can uncover much of the visible Web.
If one search engine doesn’t provide the results you’re looking for, switch to another. And most important of all, if none of the engines seem to provide reasonable results, you’ve just got a good clue that what you’re seeking is likely to be located on the Invisible Web—if, in fact, it’s available online at all. WEB CRAWLERS Web crawlers are the “scouts” for search engines, with the sole mission of finding and retrieving pages on the Web and handing them off to the search engine’s indexers, which we discuss in the next section.