I have a website http://www.polarizedmind.com/ In my google toolbar, It is PR3 But somebody else told me it is PR0. Can anybody tell me why ? Thanks in advance!
Yes, it's PR0 here. Check for yourself sing this great Firefox extension: http://www.quirk.biz/searchstatus/
Don't worry. It's pretty common to have different PRs at different resources. Actually, when google is updating the PR, it takes some time to update at all the data centers. So, depending on which data center was called for when your PR was displayed it will show for that particular one. You can check your site PR for multiple data centers by using this multi datacenter pagerank checker or seocentro pr checker for multi datacenters.
Hmm .... interesting, I just checked it at multi datacenter pr checker, it is showing PR3 for all the popular data centers. Try using http://www.polarizedmind.com in the address bar and verify.
To be honest it looks like a manual PageRank penalty for selling links. If that's the case - forget to increase the PR of that domain in the near future.