Got to wonder how long it will be until a Facebook account is a form of valid ID in itself.
It really is a dream as far as intelligence agencies (FBI, CIA and their less public counterparts) go. It used to be ridiculously hard to find the info about how to reach a person, or which buttons to push. Now, almost everyone offers it freely about themselves, and the few who don't get ratted on by their friends.
Validating identity might be a by product. But it's not anything that's hard to do anyway.
It can never be a valid ID, because they are never involved in the certification and registration process of your "official" existence.
Don't worry, they'll get there.