Wireless Carrier Abuse Of Location Data Makes The Facebook, Cambridge Scandal Look Like Amateur Hour | Techdirt 

But things got immeasurably more profitable once wireless carriers began tracking user location data, which they now sell to everyone from urban planners to government agencies. Companies like Verizon Wireless were subsequently caught covertly modifying wireless user data packets to track users around the internet without telling them. It took security researchers two years to even discover this was happening and another six months of public shame before Verizon even provided an opt out option (a more powerful version of the tech is now being used by Verizon’s Oath advertising brand).

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