Earlier quoted context omitted.
> The interface'll have the be unbelievably amazing and innovative for this to even make a dent in people's minds I guarantee you that they are going to become the default address between people 16 and under. My brother is 16 and doesn't have an email address, but he does have a facebook account.
Especially amazing given that you need an email to sign up.
Instead they are all reachable via FB.