Search Engine Book - 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|
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:
To gain some visual insight into how this works, let'...