From PR value to check how many people had readed your fanspage

what is PR?according to Alexa and google agreement,it was meant how many people look something or a document in a page in a period of time,we give each document a value meant it,it is PR.

PR is from 1.0 to 7.5.how to do it?you can put your rss of fanspage into google reader,and then you can look a PR in each document,it is a science tool to check how many people read a website or read a page of a fanspage or a blog.