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Kim Hart Sep 27
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The most valuable data tech companies collect about you

Innocuous data points can be combined to derive a revealing look at your life. Photo: Manu Fernandez / AP

The privacy debate tends to focus on how big companies handle "private" information like Social Security Numbers, credit histories, financial transactions and medical records—tangible info that can easily be used to get a peek at your life.

Intimate data: But according to University of Pennsylvania computer science professor Michael Kearns, the most valuable data is "intimate" data.