Social Media, Echo Chambers, and Political Polarization

A popular argument that is commonly put forth as an explanation linking digital technologies to political polarization is related to their ability to foster the emergence of echo chambers where extremist ideas are amplified. Sunstein (2018), a leading proponent of this view, argues that the main characteristic of social networking sites is that they allow politically like-minded individuals to find one another. In this environment, citizens are only exposed to information that reinforces their political views and remain isolated from other individuals with opposing views, in part due to the filtering effects of ranking algorithms that generate filter bubbles (Pariser, 2011) and create incentives for publishers to share clickbait and hyperpartisan content (Benkler et al, 2018). The outcome of this process is a society that is increasingly segregated along partisan lines, and where compromise becomes unlikely due to rising mistrust on public officials, media outlets, and ordinary citizens on the other side of the ideological spectrum.