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The effort revolves around Google’s quality raters, over 10,000
contractors that Google uses worldwide to evaluate search results.
These raters are given actual searches to conduct, drawn from real
searches that Google sees. They then rate pages that appear in the top
results as to how good those seem as answers.
Quality raters do not have the power to alter Google’s results directly. A
rater marking a particular result as low quality will not cause that page to
plunge in rankings. Instead, the data produced by quality raters is used
to improve Google’s search algorithms generally.