Is it the buying and selling of links that is a "problem" or is
PR, the core of Google search technology, obsolete?
Quote:
6.1 Manipulation by Commercial Interests
These types of personalized Pageranks are virtually immune to manipulation by commercial interests. For a page to get a high PageRank, it must convince an important page, or a lot of non-important pages to link to it. At, worst, you can have manipulation in the form of buying advertisements(links) on important sites. But this seems well under control since it costs money. This immunity to manipulation is an extremely important property.
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Clearly, this premise for why
PR is so "good" is not accurate. It wasn't "immune" then and most certainly isn't "immune" now.
Dave