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The study was by no means perfect in it's execution and the results seem to be so staggeringly good as to invoke a degree of skepticism, but the overall observations are sound and above all, interesting.
SEO Effect candidly acknowledge the limits and flaws in the experiment. To use their own words "on the Internet, there is no such thing as a lab-test" so the effect of +1 votes on ranking cannot be measured in isolation of seasonal trends, geographical differences, a sudden critical mass of users and Google's own tests of the +1 system. Factors such as tweeting the experiment to get more users involved and the natural personalization factors that come into play as a logged in Google user also may have skewed their test results.
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