Trump often seems like a one-man set of Aesop-like fables — with easy-to-decipher morals like “those who lie down with dogs will get up with fleas” or “when someone tells you who he is, believe him” — but because he is president of the United States, his actions do not simply end in a tagline moral; rather, they ripple outward like a toxic tsunami, creating havoc in the lives of millions. Once he has left office, the damage he has done to American institutions and the country’s foreign policy will take years to repair. And to the degree that his election was a reflection of larger dynamics in society — from the growing partisanship in politics, to the profusion of fake stories on social media, to our isolation in filter bubbles — his departure from the scene will not restore truth to health and well-being, at least not right away.

that people in the West had also stopped believing the stories politicians had been telling them for years, and Trump realized that “in the face of that, you could play with reality” and in the process “further undermine and weaken the old forms of power.

Because social media sites give us information that tends to confirm our view of the world — what Pariser calls “an endless you-loop” — people live in increasingly narrow content silos and correspondingly smaller walled gardens of thought.