When Strong Social Norms Divide: The Paradoxical Role of Cultural Tightness–Looseness in the Polarity of Online Discourse

While online polarization has garnered significant global attention, the role of societal culture in shaping polarized discourse remains underexplored. This research examines how cultural tightness–looseness—the extent to which social norms are strongly enforced and deviance is sanctioned—influences the polarity of online discourse, conceptualized as divergence in expressed evaluations across users rather than individual extremity. Building on compensatory behavior theory, the authors propose that chronic normative constraint in tight cultures motivates compensatory expression in digital environments where monitoring and sanctions are weaker, producing greater dispersion in expressed evaluations. Across three large-scale field studies, tight (vs. loose) cultures exhibit systematically different levels of discourse polarity across Booking.com reviews, Twitter microblogs, and The New York Times comment forums, at both national and U.S. state levels. Critically, this compensatory dynamic is context-dependent: cultural tightness amplifies discourse polarity in low-normative-salience domains (e.g., product and service evaluations) but constrains polarized expression in high-normative-salience domains (e.g., political discourse). These findings advance tightness–looseness theory by revealing its context-sensitive effects on expression, extend compensatory behavior theory to aggregate online discourse, and position societal norm strength as a macro-level driver of polarization in digital environments.