Google cares about the quality of the websites linking to your site, and sites with a large number of spammy or low-quality links pointing to them saw their rankings drop severely after the Penguin update was released. But it can be difficult for most websites to maintain a 100% ai???cleanai??? link profile. A study found that Googleai??i??s tolerance for spammy links has declined. Meaning that while sites used to be able to get away with spammy links making up to 80% of their link profiles, websites are now triggering Google penalization for having as little as 50 percent of their links be from low-quality sites.

The study also analyzed the link profiles for the top 50 sites. Of these, 36/50 canadan drug store. had ai???cleanai??? profiles where less than 10 percent of their incoming links were from questionable sources.

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