Danny Sullivan article examines a potential change in how Google deals with paid links. Paid links may result in
PR drops and site bans.
http://searchengineland.com/071007-173841.php
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Last week, I noticed the Stanford Daily had dropped from when I wrote the above in April to PR7 today. That's a huge drop that has no apparent reason to happen. Some others were also reporting PageRank drops. So I pinged Google, and they confirmed that PageRank scores are being lowered for some sites that sell links.
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