As part of a well put together evergreen article discussing of Google's "PageRank" algorithms, important to all marketers who hope their online sites will get lots of traffic, Dharmesh Shah points out that the algorithm is believed to be calculated on a logarithmic scale, much as the Richter Scale, used to measure the intensity of earthquakes, is logarithmic. The big difference between a linear scale and an algorithmic scale is the startling difference in magnitude. The difference between a page rank of one and two is an order of magnitude, or 10 times. as the difference between an earthquake described as four is 10 times the magnitude of an earthquake rated as a five.
The difference between a page ranking of one and three is two orders of magnitude, or at least 100 times different. What does that mean for search engine optimization? Simply that, no matter what you do, only a few "pages," out of all pages available on the Web, ever have the top ranks. On a scale of zero to six, the top sites, ranking "six," represent just 0.1 percent of all websites for example.
The practical impact is a bit like the notion of how many Twitter followers a person attracts. In practice, only a small number of celebrities have "millions of followers." On the web, only a relatively small number of sites, often large media companies, big brands or celebrities, actually have the top page ranks.
That doesn't mean content marketers should be careless about search engine optimization. It just means that such techniques only work, up to a point. "Order of magnitude" changes in page rank are quite difficult. See Read more here.
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