Fake news and the Washington Post

Facebook's Zuckerberg is trying to eradicate "fake news" from his product.  The problem is deciding what news if "fake."

For example is this fake or real: "Trump has no idea what’s going on in Syria." No idea? Doesn't know that there's a war going on?

It just happens that this headline is on the Washington Post website just below the story about fake news on Facebook.

Forget about Facebook which is devoted to cat pictures, how can we protect the American public from the fake news in the Washington Post?