There's actually a really simple and elegant penalty - forfeiture of the device used to access the social media. With all seized devices to then be wiped and donated to low income school districts/families. This gets more complex when using something like a school computer, but I think it's a pretty nice solution outside of that. That's going to be a tremendous deterrent, yet also not particularly draconian.

Yep thats what low income families need: more cell phones.

Now they too can get on social media!

Is your position that no age limits should exist for anything?

I never said that. You introduced that notion to the conversation.

This is already the reality for alcohol and plenty of other things. Maybe not everywhere. Reality check: parents giving unrestricted access to these things are usually perceived as irresponsible.