I'm 90% sure this is just political posturing. However, if it were to pass I can't imagine how they expect social media companies to be accountable for making

I'm 90% sure this is just political posturing. However, if it were to pass I can't imagine how they expect social media companies to be accountable for making sure that no users can post any COVID-19 or vaccine misinformation. Obviously we can't sit a team of doctors down and have them check every post for scientific accuracy before it's allowed on these sites. The only way I can think of actually enforcing this, whether on Facebook or on your local community forum (Hacker News included), would be to automatically ban any post that references anything related to COVID, vaccines, or any other keywords that could be associated with misinformation. I imagine any posts that trigger the keyword detector and get hidden would be replaced by a note that explains the law and contains a link to contact their representatives to complain. It wouldn't last very long. If we want free discussion online, we can't simultaneously demand that every platform police the content of every post against vague standards.