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And here we begin to see how the age of social media resembles the pre-literate, oral world. Facebook, Twitter, Snapchat and other platforms are fostering an emerging linguistic economy that places a high premium on ideas that are pithy, clear, memorable and repeatable (that is to say, viral). Complicated, nuanced thoughts that require context don’t play very well on most social platforms, but a resonant hashtag can have extraordinary influence.

A cursory look at history reveals that propaganda and disinformation are nothing new. In fact, humans have always lived in the age of post-truth. Homo sapiens is a post-truth species, who conquered this planet thanks above all to the unique human ability to create and spread fictions. We are the only mammals that can cooperate with numerous strangers because only we can invent fictional stories, spread them around, and convince millions of others to believe in them. As long as everybody believes in the same fictions, we all obey the same laws and can thereby cooperate effectively.

The truth is, truth has never been high on the agenda of Homo sapiens. If you stick to unalloyed reality, few people will follow you. False stories have an intrinsic advantage over the truth when it comes to uniting people. If you want to gauge group loyalty, requiring people to believe an absurdity is a far better test than asking them to believe the truth. If the chief says the sun rises in the west and sets in the east, only true loyalists will clap their hands. Similarly, if all your neighbors believe the same outrageous tale, you can count on them to stand together in times of crisis. If they are willing to believe only accredited facts, what does that prove?

Yet the difference between holy books and money is far smaller than it might seem. When most people see a dollar bill, they forget that it is just a human convention. As they see the green piece of paper with the picture of the dead white man, they see it as something valuable in and of itself. They hardly ever remind themselves, “Actually, this is a worthless piece of paper, but because other people view it as valuable, I can make use of it.” If you observed a human brain in an fMRI scanner, you would see that as someone is presented with a suitcase full of hundred-dollar bills, the parts of the brain that start buzzing with excitement are not the skeptical parts but the greedy parts. Conversely, in the vast majority of cases people begin to sanctify the Bible or the Vedas only after long and repeated exposure to others who view it as sacred. We learn to respect holy books in exactly the same way we learn to respect paper currency.