Facebook, this kind of stuff is inherent in their business model. Our data is the only obvious thing they can turn into money.
You could freeze your credit with Equifax, if you're not looking to take out new credit lines. It costs money, but I've heard it pretty much stops them from making money off your info. That's why the credit agencies are pushing things like "credit locks," which don't have legal mandates behind them meaning they can design the service to suit themselves.
They are a financial stalker for others
However, I'm not an expert and I'd like to hear more about this.