Who will be able to update your Facebook after you die or even if you become disabled? Who will notify your friends and acquaintances of your death or disability? Who will be able to reply to messages sent to you?Assuming you will not be able to you?
The answer is “nobody” unless you take action in advance to designate a digital heir of your Facebook account, someone who can speak for you when you are no longer able to speak for yourself. Luckily, you can do that within a few seconds.
You can choose a family member or close friend to care for your account at https://www.facebook.com/settings?tab=security (and sign in if you have to). Click on the link for “Legacy Contact – Choose a family member or close friend to care for your account if something happens to you.”
I just updated my information there and suggest you do the same.