Yes, users of social media are free to share what they please, but anyone who is, advertises themselves as, or comes across to a reasonable person as a news organization should have a legal obligation to tell the truth. Additionally, where the truth is not known, it should be illegal for such organizations to make things up, but rather these organizations should have to wait before making more informed judgements. This would diminish the capability of users to share fake news as the fake news would not exist, as opposed to simply not be shared.