(Part of) the problem is a lack of transparency to the cost you pay. >They voluntarily did it. If we're going from voluntarist morality then it seems okay ini

(Part of) the problem is a lack of transparency to the cost you pay. >They voluntarily did it. If we're going from voluntarist morality then it seems okay initially but there are two main complicating factors that I see. (1) Facebook and this app appear to be free. In reality they have a cost but because that cost takes the form of something other than money, the monetary value is obscured. (2) Even the data itself is obscured from the user. Users don't know what data they've handed over, how it's been collected, what conclusions have been drawn from it, who it's been sold to, whether it's been combined with other data sources, etc. Even the most voluntarist among us would probably see something wrong with the US healthcare system where you can't know the price of your services until after you've accepted them. Social media data collection is even one worse step than that because you never find out what price it is you've paid. A fix to this is radical forced transparency, just like what GDPR is going to do.