> You're imagining that a social network would be willing to geofence off an entire state in order to not comply with a fairly straightforward to implement regulation.

I mean, the company can comply, and users can go around those restrictions by lying to the company. Whether the company decides to geofence or comply, it doesn't affect how enforceable this specific law would be at all. Users can go around it with equal ease in either case (as long as real identity verification for online accounts doesn't enter the equation).