What Google says The best information about PageRank is, of course, straight from the horse’s mouth. We therefore felt it would be helpful to ask Google themselves about PageRank. Obviously, we realize Google won’t provide us with the exact specifics about PageRank or comment on the validity of what we've written However, we did want to ask them some general questions to provide us with an overview of how they see PageRank - now and in the future. We hope this this short interview will help debunk a few myths and answer some questions Question: Can you answer the age old question for us? Is PageRank named after the fact it is "page" based, or is it named after one of the creators? Google: PageRank is named for Larry Page, Google co-founder and president, Products. Question: Does Google view PageRank as being a significant distinguishing feature from the other search engines? Google: PageRank is a technology which contributes to the speed and relevance that differentiate Google from other search engines. In addition, Google employs 100 other algorithms to its ranking formula. Question: Does Google believe that PageRank significantly benefits the quality of its results pages and does it expect this to continue in the future? Google: Because of the scalable approach PageRank uses to analyze links, it will continue to be a significant factor in Google’s search results. Question: Several people have been known to try to data mine the PageRank information given by the toolbar, how does Google feel about this? Google: Mining PageRank data from the Google Toolbar is against Google’s terms of service. Question: How useful do you think the PageRank information is on the toolbar for a) normal users b) webmasters c) search engine optimization professionals? Google: The PageRank information on the Google Toolbar is an estimate and is intended only for informational purposes. Many users have found it interesting and webmasters have been known to use it as a measure of their performance. However, because it is a rough estimate, the value to search engine optimization professionals is limited. Question: One method that people have been known to try to boost PageRank is by using link farms and guestbooks. How is Google likely to react to a site doing that? Google: Google’s engineers are constantly working to update Google’s ranking algorithm to prevent manipulation of Google’s rankings. Source: http://www.top10optimizer.com/2009/04/what-google-says-about-pagerank/
i search for this phrase "Mining PageRank data from the Google Toolbar is against Google’s terms of service" without success. Also there is no source (bad practice). However, this is not necessary accurated now.
PageRank is to show the best results like if I have a gaming site with 5/10 PR it will show over other sites with THE SAME content with a lower PR.