London • Officials demanded Monday that an advertising firm stop using a network of high-tech trash cans to track people walking through London’s financial district.
The Renew ad firm has been using technology embedded in the hulking receptacles to measure the Wi-Fi signals emitted by smartphones, and suggested that it would apply the concept of “cookies” — tracking files that follow Internet users across the Web — to the physical world.
“We will cookie the street,” Renew Chief Executive Kaveh M...
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