well, what do you mean with the personal data? Is it like name, email, birth date, or data related to the profile? or something like what?
It is talking about how social networks make profit, you provide your personal data but they never share a dime.
No, can say what any one can do with our personal data and for that this blockchain technology is been developed to secure the peoples information and the transfer between them. They can make a large amount of profit from our data as they sell them to the promotion company our personals numbers which they later use for the promotion.