This book investigates how the structure of the American media ecosystem, rather than just social media algorithms, facilitated the rise of partisan polarization and the spread of disinformation during the 2016 election cycle. The authors, a team of researchers from the Berkman Klein Center for Internet & Society at Harvard University, utilize a massive dataset of media links and social media interactions to map the flow of information. They argue that the right-wing media ecosystem operates as a distinct, self-reinforcing network that differs significantly from the rest of the media landscape in its susceptibility to propaganda.

Experts in political communication frequently cite this work as a foundational empirical study for understanding the structural differences in modern media consumption. Readers often note the academic density of the prose, which relies heavily on data visualization and rigorous statistical methodology to support its conclusions.