Given that there’s typically no requirement for a social media page to actually belong to the person named on the page itself I can’t imagine how this could possibly be legal or even enforced.

I could just say “this Facebook page under the name of my incarcerated brother does not belong to him. It’s my Facebook page. I just post about stories he tells me over the phone about what he’s going through. I’m under no direction from him to post anything and am posting these things of my own volition.”

Unless they want to say they somehow have jurisdiction to restrict the actions of a completely free individual this can’t possibly go anywhere.