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found this in an article
Aaron Wall: I have seen sites with mostly low quality links rank well for fairly competitive phrases. I have also seen sites with cheesy reciprocal link directories not rank until AFTER they pulled the reciprocal link list off their site. Also, the more good links you have the more shady stuff you can get away with.
Ben Pfeiffer: They say they look for paid links with probability models and sophisticated algo tricks. Some sites are easily identified and prevented from passing pagerank. There are plenty of sites however that are not targeted like this and still useful for buying links from. I would be random, deliberate, and dont' follow the crowd when buying links.
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