"They’re “selling” shopping habits the same way Facebook “sells” personal data about its users: in-network. It’s a clever privacy work-around. Just as Facebook allows advertisers to specifically target certain kinds of users based on their profile information (without actually providing that profile information to the advertisers), banks plan to allow advertisers to send deals and coupons to their customers based on what they’ve bought before. That way, no user data actually leaves the network — instead, deals just enter the network. Each time a customer cashes in on one of those deals, the bank gets a commission."
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