Imagine a world that considers knowledge to be “elitist”. Imagine a world in which it is not medical knowledge but a free-for-all opinion market on Twitter that determines whether a newly emergent strain of avian flu is really contagious to humans. This dystopian future is still just that—a possible future. However, there are signs that public discourse is evolving in this direction: Concerns with “post-truth” politicians and “fake news” have exploded into media and public discourse during the last few years. I examine some putative causes for those trends, and how they are expressed in people’s attitudes towards scientific propositions with a particular focus on vaccinations.