Re: Not so fast
Disagree with Alister's conclusion.
The vast majority of the population Do Not Care about their personal data.
That is a bit like looking at the UK population and their widespread obesity, and concluding that most people do not care about their own health or future. Not quite true.
The majority of Facebook users are too young to know that "personal data" is a thing. Their older siblings have some idea it is a thing but have not formed a view. Their parents know it is a real thing and some act on it, while others assume it can't be helped and so exclude it from consideration.
A bit like junk food. Infants don't know it is bad. Older children do. Parents know and may act on it (feed their kids wholemeal bread) while others don't bother (fizzy pop). Like over-sharing, a diet of junk food has consequences for you and your future, and understanding that requires a degree of maturity and learning that many of the users have not yet attained.