Why should the "fact check" at all? That's not their function. It's the reader's perogative whether they want to believe what they read. Leave everything up as posted (unless it's to incite a riot or terroristic) with no responsibility what anyone posts. They shouldn't be liable, nor should they filter or "fact check" anything.
Why do we have consumer protection for anything? Let's just have a blanket policy of buyer beware for everything. We should just let any company to say and claim anything and allow/force the consumer to figure out whats truth and whats total ********.