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Interesting article. I guess anyone who tried these tactics would either have to have:
1) A huge farm of low PR sites that they can use to pulverize a site. However, Google could counter by discounting all links from sites with low PRs.
2) Have a good set of high PR sites, with equal power to a huge set of low PR sites. However, if Google detected this nuisance, they could penalize these sites for bad behavior and remove them from their index.
So I guess it would be a risky proposition to try negative SEO, though I am sure that it works some of the time.
Rich
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