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HUGE Google Search document leak reveals inner workings of ranking algorithm
(searchengineland.com)
This is a most excellent place for technology news and articles.
All it really details are the things Google gathers from sites. Potential data to be used in the algorithm, but just because they are gathered does not mean they are all used. Having a wide range of potential data points is useful for development and refinement, even if they're not used in the live version.