Search Engine Book - Chapter Seven
 by Ian Cook

Chapter Seven
PageRank, Algorithms, & Search Engine Updates

Google uses several algorithms to rank web pages. The oldest and best known of them all is PageRank. PageRank assigns a number ranging from 1 to 10 indicating the relative importance of a page. For instance, a page that is rated 7 on the PageRank scale (expressed as PR7) is considered to be an important page. Any web page rated PR8 or above is considered a very important page.

Loosely interpreted, the scale breaks down as such:

PR0 (zero) Very Weak
PR1-2 Weak
PR3-4 Moderate
PR4-5 Strong
PR6-7 Important
PR8-10 Very Important

Here are some examples of well known brands and their corresponding PageRank. As you can see, their home pages range from Important to Very Important.

  • PR6 - GEICO.com, RedBull.com, TacoBell.com
  • PR7 - GE.com, YellowPages.com, TheOnion.com, NFL.com, PGA.com, McDonalds.com
  • PR8 - eBay.com, bing.com, Slate.com, NASA.gov, NBA.com, Weather.com
  • PR9 - NYTimes.com, Yahoo.com, Wikipedia.com, CNN.com, Amazon.com, facebook.com, youtube.com, Coke.com
  • PR10 - Google, twitter.com

According to Google:

"PageRank works by counting the number and quality of links to a page to determine a rough estimate of how important the web site is. The underlying assumption is that more important web sites are likely to receive more links from other web sites."

To gain some visual insight into how this works, let'...

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