Actually, now we _have_ to have a SSN. I think babies are assigned one at birth. Nah, it's not that bad, but kids have to have one. Civil libertarians (and I ain't saying whether I am one or not) aren't crazy about the idea.

>Just as in the states (I presume) there is no number a citizen must have. You don't have to have a driver licence number, social insurance (security) number or any other number (passport, health number). A person can opt out of almost all.