I mostly agree that the scale of a system like FB makes its impact far greater.

But on the other hand, any company that can admit to controlling (at least in part) a person's interests, choices of purchases, etc. control a significant more of a person than you'd think.

Said person thinks they're making the decision themselves, but in reality they're being prodded in a certain direction. When they make a purchase and use the item, others see, and they might also be influenced as a third party, and so on.

I'd say it's pretty dangerous, but it tends to be overlooked.