The personal data get anonymized when they share information with the outsiders, saying the data is now safe.
But the researches showed that anonymized isnt quite the same as anonymous.
Such databases are used by stores and cities to track commercial activity.
de Montjoye showed that patterns emerge even when only the location and time of purchases are available.
That means its Johns card and now you might look up all the rest of his purchases.
He further added that it makes one wonder what our expectation of privacy should be anymore.
Studies like this show how metadata can be used to pinpoint specific individuals.
you could read Yves-Alexandre de Montjoye and his teams full research thesishere
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source: www.techworm.net
