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I think PR is a Google proprietary, let Google do all the hard work to protect it. However, Just for your information I have observed rapid PR changes for some sites over the past few weeks. PR8 -> PR6-> PR10 - this was the PR change (Toolbar) for a renowned web site.
So far as I have learnt changes were noticed for sites either involved in big blogging network, or the sites selling text link Ads. It is being told that Google took a special drive to identify sites selling text link Ads!
So PR Drop for V7N is more likely to be due to the second reason.
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