I'd assumed FB, Google and that ilk build up profiles of "everyone", augmenting with all-the-data to reach "this person has an Amex card, is ABC1, drives a Ford and follows the Tory party", which they feed into online ad auctions (for example)
I'd assumed FB, Google and that ilk build up profiles of "everyone", augmenting with all-the-data to reach "this person has an Amex card, is ABC1, drives a Ford and follows the Tory party", which they feed into online ad auctions (for example)