Re: you won't defeat the object
They aren't doing anything that evil with them
As far as you know. That's actually the core problem: if they don't have your personal details then "repurposing" and "sharing with new friends" cannot happen by design or "by accident". If they have your details (and they do, thanks to a gaping hole in Data Protection laws that allows them to steal it off your friends), they can do whatever they want - you are not in a position to even *touch* them legally, and they can pretty much screw over your life by working out who your employer competes with and then sell them endorsements with your name on it (which they can, according to the policy that went live January 1st).
Do not *ever* make the mistake to assume there is any benign motive behind what companies do with your personal details. This is about control and money, and they have all the tools to fight as dirty as they want.
Until I see fines that make a difference, I am inclined to believe that the only way to fight is to be careful yourself to start with. And even then they can get to you - via your friends. Or did you think Facebook bought WhatsApp just to blow some loose change?
Biting the hand that feeds IT
