Who and What rises to the top?
- Yahoo's search (2004) results are heavily influenced by their indexes, which business joins via paid subscriptions. Historically, their directory contents were determined by a person to made decisions on the sites to include, Today they use an indexing crawler) Commercial submissions to Yahoo are paid on a yearly basis. Non-commercial URLs can submit their site if they "register" with Yahoo.
- Ovature(GoTo), AlltheWeb, AltaVista and Inktomi are now all owned by Yahoo. Commercial sites pay for listings.
- Google's search results are determined by an algorithm (formula) that looks at a site' external links, total volume of visitors, and the degree to which the site content meets the search criteria keywords. Site for inclusion is free and Google has hundred of categories to help you position your site to reach the proper audience.
- Infoseek garners links by crawling submitted sites with automated programs called "robots", that follow the links.
- Hotbot lets you search Yahoo, Google and Teoma all at once. Owned by Lycos, which didn't make searches a priority, HotBot was revised in 2002.
- Ask Jeeves, uses the Teoma search engine, once know for it's question based interface, Ask Jeeves has been working on smart search technology
- AOL search uses Google. Their internal version limits searches to sites within the AOL online service. Their basis for this is that they censor offensive material, but that remains open to question.
- MSN is developing a search engine
- LookSmart, has a human edited directory, commerical sites pay to list
- DMOZ - human edited directory. Free to list, but think of it as an encyclopedia rather than a commercial vehicle.
The treatment of ads also has some differences depending on search engine and site. Some ads are presented upfront. They are clearly labeled, and they are not mixed with the search result. Both Google and Yahoo look at whatever personal data you leave laying around. Google uses your search criteria to present AdSense, which brings up ads whose content is coordinated to the search keywords. Yahoo looks at your personal demographic, and presents you with search results that try to sell you to the highest bidder, whether or not you have indicated an interest in the topic.
While my personal vote is for relevancy to search criteria, the fact that the search results are determined by formula leaves it open to "Google Bombing".How Weblogs Influence a billion Google searches a week By posting the same link on multiple blogs, it is possible to distort the formula's "outside link" factor, and vault it into the upper pages of the search results. While multiple links could reflect actual popularity, it can also be a result of dirty tricks.
So the next time you look at search results, if you don't get the information you need, try another search engine. Google, Yahoo, Hot-Bot, Ask Jeeves, Go, Alta Vista, there are a lot of them, and they don't all return the same information. There are significant differences in the way they search. (This post is from 2005, and much has changed from then.)

