Is there no way to consider social media as unreliable overall and not bother fact checking anything there? All this tech is relatively new but maybe we should think in longer time scale. Wikipedia is still not used as a source in school work because that's the direction educational institution moved. If we could give a status that nothing on social media is too be taken seriously, maybe it's a better approach.
Let me end this on a muddier concept. I thought masks was a good idea from the get go but there was an opposing view that existed at some point about this even from "authoritative" sources. In that case, do we just appeal to authority? Ask some oracle what "fact" is and shun every other point of view?