Do yourself a favor: kill the notifications off. Don't participate in the notification economy. Change your relationship from passive to active. Instead of relying on Facebook to command your attention, schedule a meeting with it. If Facebook's important to you, put 15 minutes on your calendar for it and make that the time that you check Facebook.
I immediately disabled Facebook email notifications when I first signed up. That was horrendous. On my Mac, my Mail app doesn't show a number badge of how many unread emails I have. On my iPhone, there are very limited notifications and almost no number badges. I hate those number badges.
I take control of what I read, not others. These are the little decisions that helps keep me sane and simple.