It’s a slippery slope and some fortune-telling to assume that Facebook and Twitter will not let you post based off potential incorrect facts. If anything, a caution or warning label regarding facts should offer the reader extra information. As MikeTheGreat has aptly highlighted, science is a self correcting paradigm that seeks to prove itself wrong. Old facts, tried and tested overtime, may seldom update but new and not well tested facts may evolve in due time.
Also, the claim that fact checkers are wrong more than they are right is a non-sequiter. Because the prevailing truth at the time of fact checking is the most accurate based off the current body of evidence. And as stated in my point above, our understanding of the truth crystallizes over time.