Fake News?

I keep hearing about knowing the difference between a “fake” news source and a “real” one. At first it sounded like common sense but then I saw some of the “fake” news sources listed in some Facebook posts, “The Onion” and “Click Hole”. Really? Do we really need to be protected from online satire? Maybe we should stop letting people see movies or read fiction literature? I mean, people may not know the difference, believe and act on the idea of Abraham Lincoln was a vampire slayer. And then I wonder, should we really be voting as a nation if we cannot tell the difference between satire and journalism?