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Example of Invisible Web Sites Dictionaries http://www.m-w.com Telephone Numbers http://www.infospace.com Clinical Trials http://www.clinicaltrials.gov Library Catalogs http://www.libdex.com/webcats Philanthropy and Grant Information http://lnp.fdncenter.org/finder

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Example of Invisible Web Sites

  • Dictionaries http://www.m-w.com

  • Telephone Numbers http://www.infospace.com

  • Clinical Trials http://www.clinicaltrials.gov

  • Library Catalogs http://www.libdex.com/webcats

  • Philanthropy and Grant Information http://lnp.fdncenter.org/finder

  • Translation Tools http://world.altavista.com


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Invisible Web Resources

  • http://www.invisibleweb.com

  • http://www.invisible-web.net

  • http://www.profusion.com

  • http://www.academicinfo.net

  • http://www.lii.org

  • http://infomine.ucr.edu

  • http://www.completeplanet.com

  • The Invisible Web: Uncovering Information Sources Search Engines Can’t See, by Chris Sherman and Gary Price, ZA 4550 .S54 2001

  • http://www.invisible-web.net/ website that goes with the book. Includes a subject directory of invisible web sites.


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Google is the largest search engine on the Web, indexing over four billion web pages

If you really want to find the good stuff, then always use more than one search tool

Yahoo! typically used Google for its search engine results and the Open Directory for the Yahoo! directory. Now Yahoo! has just released its own search engine Yahoo Search!

In 2003 Microsoft bots were detected indexing the Web – rumoured to release its own search engine between July 2004 and January 2005

Web Search Facts


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An estimated 73% of the Web is in English over four billion web pages

Many search engines are also directories

Some directories are also meta search engines

The Open Directory has 64,000 editors and about 590,000 search categories!

However, directories typically have much smaller databases than search engines

No search tool is able to search the entire Web, though some meta search engines go to the Deep Net, Dark Web or Invisible Web!

Google is the most popular search engine, but the Yahoo! portal is visited more often

Web Search Facts


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Types of Search over four billion web pagesServices

  • “Search engines” crawl the web and read your web pages

  • “Directories” like Yahoo depend on human-provided information to categorize sites

  • Most search services are a hybrid of both, but more dominant in one area


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A short breif over four billion web pages


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Other Resources for Search Engine Info over four billion web pages

  • Search Engine Showdown: Search Engine Features http://www.notess.com/search/features/byfeature.shtml

  • Search Engine Watch: Search Engine Features for Searchers http://www.searchenginewatch.com/facts/ataglance.html

  • How to Choose a Search Engine or Directory http://library.albany.edu/internet.choose.html


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Did you know? over four billion web pages

Most search engines...

  • are actually user-friendly (not scary) and all you need is a little bit of time...

  • have a ‘preferences’ tab that customises current and future visits

  • have an ‘advanced’ tab that helps narrow your search query

  • have help pages if you’re a newbie!

  • Allow you to use quotation marks and ‘+’ or ‘-’ signs in your search query for better results


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Power Searching over four billion web pages

  • Command charts for major search engines at http://searchenginewatch.com/facts/ataglance.html

  • Use “Advanced Search” at the search engine home page to zero in on relevant sites


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Evaluating Online Information over four billion web pages

  • Always judge a web page for relevance and accuracy:

    • Who is the Author?

    • What is the Purpose of the site?

    • Is the information Fact, Opinion, or Propaganda?

    • Is the information Reliable and Credible?

    • Is the information Current?


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www.google.com over four billion web pages


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www.google.com over four billion web pages


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