"Today, I discovered that just a few days ago, Google was issued a patent they filed on March 7, 2012. The patent, "Email spam and junk mail as a vendor reliability signal," contains the abstract:
A system and method is disclosed for determining a reliability of an online vendor. One or more groups of undesirable emails (for example, spam) are analyzed to determine a prevalence of a known vendor. A reliability indicator may be determined for the vendor based on the identified prevalence of the vendor in the emails. The reliability indicator may then be provided to a remote application for use in assessing the reliability of the vendor."

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