First off, you can't control what she does or doesn't do. If she wants to unfriend everyone you both know on FB, that's her perogative.
If, however, you are concerned about the well-being of your son, then you need to get a L involved to know what your rights are if you and your W can't come up with an amicable agreement.
If you are concerned for his safety, then first and foremost you need to act like a father. Not a husband. Be sure he is in a safe environment that you are comfortable with. It's not initiating D or saying you agree with it or whatever. It's called being a father and a man who protects his family first and foremost.
Mr Bond...or can I call you James? She may not have told me where she's moving to, she told me which town she's moving to and told me not to worry, it's a safe neighborhood. I'm also preparing for mediation if her expectations are unreasonable.