The Broken Windows Effect in the Digital Age: Online Incivility and Offline Property Crime

Wilson and Kelling's (1982) broken windows theory posits that visible signs of disorder- graffiti, litter, public drunkenness-signal that antisocial behavior goes unpunished, normalizing more serious crime. This paper asks whether the theory extends into the digital realm: does online incivility?hostile, aggressive, or hateful social media content- function as a digital "broken window," increasing offline property crime in the geographic areas where it is produced? I synthesize the emerging empirical literature and propose a causal identification strategy exploiting exogenous variation in local air quality as an instrument for online aggression. The evidence suggests that online hostility is not merely a symptom of offline disorder but a culprit: aggressive social media activity causally increases physical crime, with spillover effects extending to geographically distant but socially networked regions. These findings reframe broken windows theory for an era in which the disorder that matters is increasingly textual rather than physical.