Search Engines v. Subject Search Directories Search Engines Subject Search Directories• Websites selected by “spiders” • Websites selected by humans through automated searching • Small number of sites selected,• Goal is to have as big an index indicating “the best” as possible • Many have annotations, written• Not much information about site except URL; some have by humans small descriptions • Generally well-organized in• Order of websites unknown to hierarchies of subjects user; metadata can be • Little or no advertising on most tampered with for higher rating, sites pay for higher level• Sponsored links and advertising on sites
Subject Search Directory DefinitionDirectories are a collection of web sites that are organizedby broad subject categories. When you search a directory,you are only searching the web sites identified andincluded in that directory. Directories may be broad(covering all subject areas), or subject specific (focusing ona particular subject).
When to Use? Search Engines Subject Search Directories• When you want to see • When you want everything something that has been• When you are looking for reviewed something specific • When you are browsing
Examples Search Engines Subject Search Directories• Patron A: • Patron B:I would like to know the I would like to know goodaddress of the Proctor & resources on the web that IGamble company. could use with my high school business class that will allow them to search for businesses. I want to be able to give them something I can trust.
Other Examples• If you know very little about the subject that you are being asked about, start with a subject search directory such as ipl2.• If you are needing annotated sites.• If you are trying to find a database on some kind of information. Before everyone knew about IMDB (Internet Movie DataBase) it would have shown up here (which it still does, and with even further breakdowns.)• If you are working with a student whose teacher doesn’t want them to use the “internet.” These are more reliable sites than what a student could find on their own.
How to Use• Entering a search term. This is sometimes less successful because you have to hit the right term. (I tried to come up with a term I couldn’t hit, but I think too much like a librarian now. Your customers could definitely stumble with the wrong words.)• Drilling down. Drilling down involves clicking on the subject that you want from the main page, and selecting where you next want to go. For instance, I selected Resources by Subject on the front page of ipl2. Then I selected Business & Economics, then Business & Economic News, then on Advancing Women, a site that is for advancing women in the workplace as well as other diversity issues. This is a site that I could get to, but someone has indicated that it is unusual enough to make it on this list.
Keyword v. Drilling; a Final WordSometimes you will get different sources from using keywordversus the drilling down methods. Best suggestion is to do bothuntil you see how your search goes and you become morefamiliar with the tool.In the past, half the students walked away feeling this wasalmost the best thing they learned during the semester; othersfelt like it was a total waste of time that they would never use.My final word: It depends on the search and the searcher. Ittakes patience to drill down and you have to set your frustrationmeter to 0. That’s because you don’t have the directory of termsto use that the person who created the search directory.Read the About section of each subject search engine and see ifit gives you criteria for inclusion.
Perfection? No…Some of the sites included require you create a user nameand password.However, the individuals who created the subject searchdirectory work through criteria and decided that this wasgood information or unique enough information to make itimportant to include it.You will also see websites that you have never seenbefore. These may be websites that would appear on thefourth and fifth page of a search, beyond the normal deptha searcher would go.
Subject Search Directories of Choice• Ipl2 (Internet Public Library)• Infomine• Open Directory
Specialty Search Engines• Healthline.com (health)• Scirus.com (science)• Knowledgestorm.com (computer industry)• Trulia.com (real estate)• The Find (shopping)• And many, many moreSpecialty search engines are vertical search engines andinstead of searching the breadth of the world wide web,they search one subject area in great depth.
Deep Web, Non-Public InformationAs you learned in the last lesson, there is a lot ofinformation that is not “showing” in regular search engines.You learned about some of the ways to find information inthe Deep Web for government information.There is one other source that will help find information inthe Deep Web.Complete PlanetThere are others that are more specific, like the specialtysearch engines, but this is the lone survivor of the DeepWeb tools.
Readings• Digital Resource Images on the Deep Web• 100 Useful Tools and Tips to Research the Deep Web