Wow, it's an interesting exercise to replace "FB" with "Heroin" in your post. It still makes sense. Maybe it's time to haul up Zuckerbock in front of a Congressional Committee, Big Tobacco style, and have him claim that FB is not addictive. Or maybe a class action suit for promoting a product that damages the health of the general public.
Unfortunately, just like with Heroin, making it illegal would not stop folks from abusing it until it causes their deaths.
Well, at least the death of their sanity. And, as with Heroin addicts, FB addicts are most of the time somebody else's problem.