Aren’t you simply asking for a fact checker?
So regardless of the source (and mainly because you won’t know), you’d want to review a post for falsehoods.
Ironically I can imagine that the solution might use AI to do some of natural language processing for the task, but I digress …
The unfortunate likely complexity here is it will struggle with political bias or anywhere ideology or dogma might be involved, e.g. in some areas of medicine, where there are no hard and fast facts to rely upon.
But I can clearly see that confirming an obvious fact could be straightforward, e.g. the birth date and location of a famous figure, for example. That surely could be and should be automated?
Definitely an interesting area to watch, for sure!