Increasingly, social bookmarking websites are being used as a surrogate search engine. Yahoo, Google, and the other search engines are extremely useful tools, but they can also bring back so many websites that it becomes a real chore to wade through the useless sites to find that needle in the haystack.The reason for this is the basic way that most search engines operate. They "crawl" the web by having a computer scan websites and pick out keywords to index for a search. The computer then catalogues the links on the page and moves to those web pages to index and catalogue, and so on, and so forth until they've "crawled" the web.


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