Google calculates the ranking based on the number of other web pages that link back to the search result. This prototype large-scale search engine was developed at Stanford University. It boasts a database of 24 million pages. Other Search Options Deja News searches the discussions from newsgroups. Dogpile one of the newer meta-search engines lets users search up to twenty search engines, usenets, and ftp sites concurrently and returns the results four search engines at a time.
Dogpile searches help direct users to the search engine with the most promising results.
Using a meta search engine limits users though, because the search defaults to the most common search. Meta search engines cannot use the unique features designed for some search engines. Liszt contains information on over 90,000 mailing lists, chat rooms and usenet groups. Discussion lists can be identified using the drill-down subject categories appearing on the front page. They can also be searched at the Liszt site by size, subject and geographic location.