alt Hacker Newssure, that sounds right for how it is currently. my parenthesis above is probably wrong.
but the whole point of my example was showing that its absolutely possible to hold parents accountable for their childs actions. there are dozens of laws that do so already. so there is no excuse why a social media ban could not be written in the same fashion as those laws, rather than moving parental responsibility onto tech companies.
Laws hold parents accountable for their childrens' crimes, not their noncriminal actions. Nothing about this is saying that accessing social media is a crime -- that would be more similar to drug possession laws, firearms licensing, etc.
If your child is drinking: they are violating the alcohol possession age limit themselves; you are liable for their crime plus child endangerment if you gave them the alcohol; and whoever sold or supplied them the alcohol is violating a separate law. Sounds like we're trying to apply the same structure to social media, except (so far) with no possession/usage law.