Oops. The Callum Borchers of the world want “fake news” to mean only one thing: Crazy, sensationalist web sites with no journalistic credentials publish headlines like, “Obama born in Kenya, pledge loyalty to mosque there.” But fake news doesn’t always take that form. Sometimes fake news is 50 percent true, or even 90 percent true. But it’s the part they leave out, or fudge, or alter ever so slightly that not only makes it fake, but makes it so pernicious that someone reported it as fact.