How Phone Companies Used ‘Supercookies’ to Track Customers’ Web Browsing

AT&T and Verizon continued tracking users’ unencrypted traffic for months after backlash over the practice erupted in November 2014, researchers found.

The Verizon logo is seen at the headquarters for Northern Virginia on January 2, 2015 in Ashburn, Virginia.
PAUL J. RICHARDS/AFP/Getty Images
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