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Evaluating internet sites with info on how search engines work
 

Evaluating internet sites with info on how search engines work

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  • Go into google and do a search for martin luther king – martinlutherking.org will be one of the first sites to come up – click on “The Truth About King” – view some of the facts that are here – obvious bias – at the bottom of the home page click on “hosted by Strormfront” ask how such a site could appear at the top of google listings – then go to next slide and discuss how a search engine works Note – you may have to have your site administrator unblock www.martinlutherking.org and www.stormfront.org – check prior to the presentation
  • Starting with heavily used servers and popular pages a software program called a “spider” crawls the web. It will follow the links of the pages on each site. Have built in method to detect spamming To make for more useful results, most search engines store more than just the word and URL. An engine might store the number of times that the word appears on a page. The engine might assign a weight to each entry, with increasing values assigned to words as they appear near the top of the document, in sub-headings, in links, in the meta tags or in the title of the page. Location and frequency method is also used – where it appears in the page (near the beginning is better) and how often it appears Also contain advertising… Pages are also ranked based on how popular they are – ie how many other pages link to that site – google calls this “pagerank”
  • no one has evaluated these results so you must!!!!
  • .org, .com, .uk, .ca can be registered by anyone -

Evaluating internet sites with info on how search engines work Evaluating internet sites with info on how search engines work Presentation Transcript

  • Evaluating Internet SitesSchool Name
  • Where do you go to doresearch?
  • Research Project • You have been asked to research Martin Luther King and type his name in Google – one of the first results is: www.martinlutherking.org • Is it a good source?
  • How dosearchengineswork? From: http://computer.howstuffworks.com/search-engine1.htm
  • How much for that Keyword? • Video - Bidding on keywords
  • Buying Keywords• How much does a keyword cost?
  • Paid resultsComputerGeneratedResults –based onkeywordsandpopularity(Pagerank)
  • Evaluating a websiteCheck for • Authority • Objectivity/Bias • Content and Accuracy • Currency
  • Check for Authority • Who is the author of the site? • What is the authority or expertise of the individual or group? • What else comes up when you type the author’s name into a search engine? • Does the source have a political or business agenda?
  • Objectivity/Bias • Check for any indication of bias • Look at the domain address: .edu educational site ~ personal web page .gov government .uk British site site .org organization or .ca Canadian site advocacy group .com commercial site
  • Objectivity/Bias • What is the purpose of the site? • Does the source have a political or business agenda? • Is there an organization sponsoring the site? • sponsored by a political, business or advocacy group? If so, what can you find out about that group?
  • Objectivity/Bias• Who is the intended audience?• Is the information free from advertising?
  • Content and Accuracy• Is the information well researched and useful for you?
  • Content and Accuracy • Can the information be verified using another source? • Is there documentation to indicate the sources of the information • Does the site provide a list of sources or a Works Cited page? • Can you locate any of the source material? How reliable is this material?
  • Content and Accuracy • Have you heard about the dangers of Dihydrogen Monoxide?
  • Content and Accuracy• Links • Are there links to other credible sites with additional information? • Does the site provide a link for emailing the author or webmaster? • Did you reach this site through a reputable link?
  • Research • You found this site on famous explorers for your history project • Is it a good source? www.allaboutexplorers.com
  • Research • You found this site for your science project • Is it a good source? www.malepregnancy.com
  • Currency • Does the site clearly state a date of creation or a date for the most recent update? • Does the information cover recent changes or advances in the field or topic you are researching?
  • Summary Some examples of authoritativeAny website you use must be sites… evaluated- check for: • Authority • Objectivity/Bias • Content and Accuracy • CurrencyUse authoritative sources (example – online encyclopedias and databases) whenever possible)