Speaker series on fake news and misinformation, co-sponsored by the NULab at Northeastern University. Though some warnings about online “echo chambers” have been hyperbolic, tenden- cies toward selective exposure to politically congenial content are likely to extend to misinformation and to be exacerbated by social media platforms. We test this prediction using data on the factually dubious articles known as “fake news.” Using unique data combining survey responses with individual-level web tra c histories, we estimate that approximately 1 in 4 Americans…