Didn't notice that the PageRank on the website has reached 4. Better record it.

http://shududu.com/is still 1, and http://www.shududu.com/is 4.

PageRank is taken from Google's founder Larry Page and is part of Google's ranking algorithm (ranking formula) that identifies the rank/importance of a page. The level is from 0 to 10, with 10 being a full score. The higher the PR value, the more popular (and important) the page is. Note: Google PR is related to accurate and complete URLs. Different URLs have different PRs. The PR values of www.abc.com and abc.com are different.