For liberals, “post-truth” is the only possible explanation for Donald Trump’s somersault to the presidency. At some point, liberals believe, fake news metastasized into false consciousness: hence Trump. For conservatives and libertarians, the phrase aptly describes an information environment dominated by the liberal news media and entertainment industry.
Read the whole essay. I interpret one of the main points to be that the bond of trust between elites and the public has been broken, so that there is no longer a shared truth concerning the interpretation of events. I interpret his conclusion as being that we need to discover a new elite, one which has credibility. Easier said than done, to say the least.