[adminprof]

They actually don't, unless you define selling as they allow advertisers to select what demographics/attributes their ads target. But the actual data stays on the Facebook servers. If you're referring to the apps having access to user data, that was not selling at all, but instead a permission originally granted by users by probably forgotten about. Basically, unless you contort the definition of selling to a very different meaning, that's simply not true.

And if you do use that definition of selling, then everyone is selling your data. All the politicians who decry tech companies are selling your data using the same definition. Every advertiser, retail store, bank, basically every large business offers other businesses a way to access a specific subset of their users.

[grey-area]

Yes, that's how I define selling in the context of that sentence, as the only other way to read 'they sell your favourite movies' is the wilful misinterpretation that they actually sell movies, which would be a non-issue.

I think it's pretty clear they sell your preferences to advertisers and let apps misuse your data (there have been plenty of scandals where people didn't understand what apps would get).

This is emphatically not the business model of most businesses large or small.

[adminprof]

I think I see the confusion between us. You don't see the difference between selling data to a company, and selling ad space where the advertiser can choose for what demographics it shows up for.

Let me try to make it more clear. Do you see the difference between "hey Chase Bank, do you want to buy this file containing data about grey-area's interests, age, political stance, credit score, purchasing habits, etc." versus "hey Chase Bank, do you want to put an ad on my website that is only shown to people with credit scores above 600 and are interested in savings accounts"?

If they both seem the same to you, then I don't think your perspective is one that a reasonable person would take. If you do see the difference, then Facebook is doing the latter, but the word "selling data" conjures the former, which you do recognize as a different matter.

I'm going to ignore the nonsensical definition you gave of selling data = selling movies, being the only other definition of selling you could imagine, in hopes that it was just an oversight.