Google, for its part, maintains that it doesn’t use email keywords when gathering information and that individuals must opt in to let the company combine the different types of data.
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Google Links Personal Email Data to Web Search Activity
After buying the advertising network DoubleClick approximately nine years ago, Google said it would make maintaining web surfers’ privacy a chief concern. However, it has since changed its policy, saying that information gathered from online activity can now be combined with information gathered from email and other sign-in services. So reports ProPublica.