Customers as UNpaid Employees-u are-

 Facebook's Terms Of Service state that not only do they own your data (section 2.1), but if you don't keep it up to date and accurate (section 4.6), they can terminate your account (section 14). You could argue that the terms are just protecting Facebook's interests, and are not in practice enforced, but in the context of their other activities, this defense is pretty weak. As you'll see, there's no reason to give them the benefit of the doubt. Essentially, they see their customers as unpaid employees for crowd-sourcing ad-targeting data.

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