> then they're not really interested in keeping in touch

Yes, or they are simply not interested in stories about the risks and plans of Google and Facebook. Or do not understand when you try to explain it.

A significant part of my family and friends is already on that path: only reachable through sites like facebook or gmail. Taking some "political stance" in not joining (how they see it) will very readily be translated in "you are not joining. you are not really interested in keeping in touch with me."

So no. It will work out precisely the other way around.