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Verizon, At&t Tracking Their Users with 'supercookies'

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Cellphone on plane

A passenger checks her cellphone before a flight in Boston in this Oct. 31, 2013, file photo.

Credit: Matt Slocum/AP

Verizon and AT&T have been quietly tracking the Internet activity of more than 100 million cellular customers with what critics have dubbed "supercookies"—markers so powerful that it's difficult for even savvy users to escape them.

From The Washington Post
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