Right, and how will they determine what a social media site is? People in power don't get it because they're mostly from the generation when the Internet hadn't yet taken over every aspect of civilization.
Trying to impose a ban is such a lazy and naive solution. Kids will find alternatives. There are thousands of options for kids to go online and interact with one another. My guess would be that video games would become the next social platforms, and then what, ban video games? ban multiplayer games? I'm not saying do nothing. There are plenty of potential and creative solutions. Maybe something like incentivizing companies to build a kid-friendly version of their apps, and advising parents on how to be aware of what they're using. Banning tech is usually not the answer in a world where tech is more and more part of everything.