http://bit.ly/qrbOZA Google took a lot of the power out of high PR bookmarking sites when it appeared they (perhaps) let the various sites know that their dofollow link attributes were causing issues. Places like Technorati and Digg, plus a few others, were able to rule the first pages of SERPS in Google as a result of their high PR status


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Strategic Social Bookmarking Methods for Business Expansion