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The author tries to quantify the suspected bias of Google against conservative and climate-skeptic websites, and is successful in showing that these sites definitely show up much less in Google search results. In some cases he labels the search results so low he calls it blacklisting.
The results show that Google Search is heavily biased against conservative domains, and some respectable conservative domains seem to be blacklisted: thegatewaypundit.com, pjmedia.com, americanthinker.com, redstate.com, powerlineblog.com, drudgereport.com
The numbers for Drudge are especially damning, as they come up in Google searches less than any other site measured, despite having routinely more traffic than anyone, conservative or liberal.
It is still possible that the differences here are just a reflection of society, and that conservative sites simple get less traffic, but I increasingly do not believe this and this paper adds weight to the growing conclusion by many that Google has its thumb on the scale.