PageRank was born in 2000, with a specific algorithm for page sorting, scoring scale of 0-10 (the higher the better), allowing users to intuitively understand the value level of the page, but also spawned a huge SEO (search engine Optimization) underground industry, so many worthless pages can also get high scores.
Over the years, Google has now gradually diluted the concept of PageRank, for example, its Chrome browser has never been shown, find the console in 2009 canceled the project, Open directory site was closed in 2010, 2011 and stopped the Firefox Google toolbar. The final update PR is December 6, 2013.
Currently can be used to directly query PageRank toolbar, the browser is not many, basically only left ie Google Toolbar, but most of the time is not useful.
In fact, Google has not updated PageRank's algorithm and results for several years now. In the future, Google will completely abandon the provision of PageRank in public places, will only save for internal use.
The impact of Google PR value stop update