I don't think it's a given that Social Media's harms are at the level of fast food. Figuring out where it falls on the "harmful to society scale" is a worthwhile discussion. Is it sugar, e coli, or something in between?

We do have regulatory protections around food. We don't think it's pragmatic for everyone to run their own home lab to determine if there's poison in their food. It may also not be pragmatic to expect everyone to check sources or even be able to locate the truth of a source (I sure can't most of the time!).