I was looking at some discussion about Facebook's policies concerning fake news, and one criticism was that people could choose to flag things that are just an opposing point of view. They disagree, but it might be completely accurate. They simply disagree with the opinion expressed. There was a concern that what might happen is that you would have a deluge of people saying, “This is fake news”, when in fact they're trying to downgrade something they disagree with.
On February 14th, 2017. See this statement in context.