Disinformation. Trolling. Conspiracies. Social media pile-ons. Campus intolerance. Call it what you will but together they are a multi-front challenge to America's ability to distinguish fact from fiction and elevate truth above falsehood. Jonathan Rauch joins Danielle to discuss what we can do about it, based on his new book "The Constitution of Knowledge: A Defense of Truth." PLUS: Caitlin Flanagan dishes on women, dating, and more on THAT interview with Nancy Jo Sales.