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The study of how large populations think, feel, and behave in an era defined by social media, information overload, and algorithmic curation. Unlike 20th-century mass psychology, which focused on physical crowds and broadcast media, 21st-century mass psychology must account for people who are simultaneously connected and isolated, scrolling alone together, forming tribes without ever meeting. The key insights: attention is the scarce resource, outrage is the most reliable engagement metric, and identity has become a series of performances for invisible audiences. Mass psychology now explains phenomena like viral misinformation (emotion spreads faster than facts), cancel culture (digital mobs with infinite memory), and political polarization (algorithms that show you what you already believe). It's the psychology of people who are more connected than ever and more lonely than ever, which is exactly what the algorithms want.
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