Federal and municipal social media bans are also unlikely to work. It's best regulated at the household level.
Much as I would like to completely ban everyone in the world from visiting facebook and twitter, you can't really do that and still pretend to have a free society that cares about human rights. What you could do instead is outlaw the surveillance capitalist business model they depend on — universally, through strong privacy laws not aimed specifically at social media or any other narrowly-defined type of application.