I have doubts that you can do it without heavy automation. Sure, eventually some human can decide whether something is "factual-ish" or not. But producing content is much easier and can be automated, so the attackers can flood the system.
If you want humans involved, you end up with a gate keeper, which essentially means "unless you're an accredited media organization, your content is considered fake", because you can't vet individual pieces.
If you want humans involved, you end up with a gate keeper, which essentially means "unless you're an accredited media organization, your content is considered fake", because you can't vet individual pieces.