I couldn't agree more. I don't think Facebook should necessarily block fake news (however you want to define it) but it might be nice to let me know before I share a story that they think it's satirical because of reason A and reason B or that it's inaccurate for other reasons.

This is good for me because I don't look dumb for sharing something that's incorrect and it's good for Facebook because now they know even more about me (that I love satire but hate fake news, for example).