How would this even work? Web sites politely ask everyone if they're under 18 and then turn on these behaviors? Without some sort of strong notion of online id

How would this even work? Web sites politely ask everyone if they're under 18 and then turn on these behaviors? Without some sort of strong notion of online identity, I just don't see how any of this is meaningfully implementable. And I really don't think anyone wants the equivalent of a driver license for using the Internet.