This reading will discuss various
strategies and tools for searching the Internet. This is a crowded
field, with exotic names such as Dogpile, Google, Yahoo!, to
name a few. Hopefully this lesson will give you a flavor of the myriad
of tools (usually called "search engines") and strategies available for
searching the Internet. While most folks believe they're fairly
proficient at web searching, in fact most folks don't know the most
basic elements of how searching works or how to be more a more savvy
searcher. There are also quite a number of very important but often unknown aspects to searching that dramatically
impact the integrity, safety, and overall nature of the searching
experience. It's not as simple as you may think! So let's make sure
you're not one of those folks! We will
start with the basics of searching. Later, you'll learn more about many of the risks, challenges and leading-edge issues that impact your searching much more than you may think.
First, search engines typically use Boolean logical operators to do their searching. Basically, this means that you can use specific words to set up a fairly sophisticated search that can be precisely defined. Search engines often recognize the operators "and," "not," "or," and parentheses. The particular syntax that activates these logical operators varies from one search tool to another, but the general principle applies to all search engines. I'll explain each of these briefly below:
And - this allows you to search for items or directories that include two or more terms of interest. Both terms will have to be in the document or directory title to be included in your search results. An example of an "and" search is the following:Words to search for: utah and weather
(Note: Most search engines will assume an "and" if you do not place an operator between the two words - "Utah weather" will return the same search results).
Not - this operator allows you to exclude a term from the items you are searching for. You might wish to locate documents on foreign language programs except for ones involving Spanish. This search would look like the following:
Words to search for: language programs not Spanish
Or - the "or" operator should only be used rarely because it will return items that include _either_ of the terms you enter. For instance, the following search would give you a huge number of results:
Words to search for: ibm or mac
Parentheses - Parentheses allow you to do rather complex searches by breaking your search into separate elements. For instance, say you want to find items on travel in either Spain or Portugal. Your search would look like this:
Words to search for: travel and (Spain or Portugal)
There are several combinations of this type that can be made. My advice is to avoid making your search too complex. Start with a fairly complex search, and then break it down until you get the results you need.
Second, search engines allow for word truncation. This means that you can enter a word root as a search term and then add an asterisk at the end (sometimes the asterisk is not required). The search tool will search for any word that begins with that root. For example, the search term "librar*" would return items with the following words:
librarylibraries
librarian
librarians
Truncation can be quite useful, particularly with the issue of plurals and singulars. Say you were interested in items on "librarians" or "librarian." You could enter "librarian*" your search term and get items with either term in them.
Third, typically you can control how many results or "hits" a search engine will display per page. A standard search will default to no more than 50 or 100 items per page. You can usually modify this parameter via a pop-up menu or dialog box at the site.
In the past few years, many very
sophisticated web-based search tools have been developed which can
search web pages, Usenet news postings, electronic phonebooks and more.
There is a lot more to searching the Internet than Google. Search engines are essentially databases in which computer users
may search by asking questions, called "queries." As useful
and powerful as many of these search sites are, they are not as
comprehensive or as useful as they might appear. Google is one of those databases, but like any search engine database, it doesn't catalog the whole Internet, not by a long shot!
When we say that Google or other search engines don't cover the entire Internet, what does that mean? A recent Associated Press report cited a study of 11 of the largest search sites. The study found that even the most powerful sites only cover about one-sixth of the web pages available on the Internet at any particular time and that the time it takes them to list new sites (i.e., find and index) is growing. The study found that on average it takes a new web page up to six months or more to make it into a search engine's listings. With nearly one billion websites out there, that means any one search engine is missing as many as 750 million sites. Also, the various search engines vary widely in their quality, speed, and ease of use.
There are other problems with our current web search approaches. A recent article in the New York Times reviewed the so-called "deep web" problem. Search engines rely on programs known as crawlers (or spiders) that gather information by following the trails of hyperlinks that tie the Web together (see more on this below). While that approach works well for the pages that make up the surface Web, these programs have a harder time penetrating databases that are set up to respond to typed queries. Click here to read more about the strategies researchers are developing to mine the "deep web."
In general, search engines use two methods to gather new web sites for their listings. First they accept self "nominations" from web page developers. You will see a link on most search engine home pages indicating where someone can go to add pages to that search site. Second, most web sites employ sophisticated software robots or "spiders" whose job is to continuously surf the web "harvesting" new web pages. These spiders use sets of rules (called algorithms) to place sites in more-or-less relevant categories. Not all of the spiders do a great job of categorizing the web sites they find (as you surely have found if you have used them).
The best search sites don't rely on
computers to do all of their categorizing. They do it the old fashioned
way--with librarians! That's one of the reasons scholarly index sites
such as the ones found in the Lindell Library are more helpful than a
traditional search engine. Despite
its popularity, Google's index (as contrasted with a dedicated
library-based search engine
tool such as PsychLit) has a much less helpful academic database.
Smaller special-purpose databases such as PsychLit make up for their
relative smallness with quality. It is very high quality because a real
live person actually looks at the sites before they are placed in
the PsychLit index.
Library databases such as PsychLit and
others are very high quality as compared with general-purpose search
engines such as Google, Yahoo! and Bing, but there's a trade-off. The
subscription to PsychLit costs the library about $15,000 per year.
Remember one of the basic rules of media literacy: "If you don't pay for
it, then you are the product." Likewise, if you do pay for it, you
often get something of value in return--in this case, a higher quality
vetted database of resources. For academic and scholarly work, it is
almost always better to login to your library's website and use their
resources. As another wise person once said, "There's no free lunch."
The best way to test search sites is to try several and then bookmark your favorites for future visits. Typically these sites require a Web browser, although some may use stand-alone applications, some of which are Java-based. A partial list of some popular general-purpose and special-purpose search engines and indices may be found below.
When you're looking for something
specific, like movie reviews, zip codes, legislation, etc., the key to
finding useful data on the the Internet may be starting with the right
search resource. Many sites are specific to one or just a few topics or
databases, making them a much better resource for that specific domain
than the big generic search engines like Google. Here's a quick review of some of the sites best suited for
finding specific kinds of information.
To
find information about... |
...check
here. |
Government |
www.usa.gov |
Health |
www.medlineplus.gov |
Law |
Legal Information
(from LexisNexis) |
Movies |
www.imdb.com |
People |
www.accurint.com (also from
LexisNexis--this site is not free) |
News |
therealnews.com |
Reference |
www.refdesk.com |
Words |
www.onelook.com |
Google has some hidden features that
may be extremely useful. Here's a table describing some of these
features. Go to http://www.google.com/help/features.html for a complete list.
Feature: |
What to type: |
Result your get: |
Dictionary |
define:word |
Links to definitions |
Calculator |
10*35+4 (or any other equation) |
The answer |
Phone Book |
first name, last name, zip code, or last name, zip code |
Phone book matches |
Special codes |
package tracking numbers, area codes, vehicle ID numbers |
Relevant results |
Stock Quotes |
sticks:ticker symbol |
Recent stock quotes |
Maps |
street address, city, state, or zip code |
Links to maps |
Who Links to... |
link:site URL |
Websites that link to that URL |
Search only one website |
search term
site: site URL, e.g., |
Search results limited to that site |
A website has been developed that automates access to many of these special Google features. it's called Soople, and is available at: <http://www.soople.com/>.
Google
has prepared an online course to assist users in becoming power-searchers. The class is an
actual online course: you need to register and attend (virtually) and
you receive a certificate when it's completed. New sections of the
course open periodically. Click here to learn more about the next class.
DuckDuckGo is a search engine which bills itself as, "The search engine that doesn't track you." All modern digital devices track users activities and habits. This is why you get personalized ads on Facebook pages and how your iPad knows to connect to your favorite WiFi network. But some have noted an interesting and perhaps unintended result of tracking user searches, something called "the filter bubble." (For more on this phenomenon, see the discussion below.) DuckDuckGo is an attempt to provide relevant search results without maintaining records of users' searches beyond your current search. See what you think at:
Search Engine Showdown is a web site which offers comprehensive comparisons of the major search engines including lists of features of the major search sites, reviews, hints on effective search strategies, statistics on usage of major sites, and more. The site even provides links to a Usenet newsgroup and a listserv on the topic of search engine technology and performance.
http://www.searchengineshowdown.com/
Happy searching!
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