One of today's most controversial and consequential issues is whether the global uptake of
digital media is causally related to a decline in democracy. We conducted a systematic …

How do the Internet and social media affect political outcomes? We review empirical
evidence from the recent political economy literature, focusing primarily on work that …

We provide quasi-experimental estimates of the impact of social media on mental health by
leveraging a unique natural experiment: the staggered introduction of Facebook across US …

Does the consumption of ideologically congruent news on social media exacerbate
polarization? I estimate the effects of social media news exposure by conducting a large …

Media outlets often present diverging, even conflicting, perspectives on reality—not only
informing, but potentially misinforming audiences. We study the extent to which …

Perceptions about others play an important role in shaping people's attitudes and behaviors,
as well as social norms more broadly. This review presents a meta-analysis of the recent …

The scale, volume, and distribution speed of disinformation raise concerns in governments,
businesses, and citizens. To respond effectively to this problem, we first need to …

This paper investigates the link between social media and hate crime. We show that
antirefugee sentiment on Facebook predicts crimes against refugees in otherwise similar …

We study how social media affects election outcomes in the United States. We use variation
in the number of Twitter users across counties induced by early adopters at the 2007 South …

We conducted a nationwide field experiment in China to evaluate the direct and indirect
impacts of assigning firms to public or private citizen appeals when they violate pollution …