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The study of how large populations think, feel, and behave in an era defined by unprecedented connectivity, information saturation, and algorithmic governance. Unlike previous centuries, where masses were shaped by broadcast media and physical proximity, 21st-century masses are shaped by personalized feeds, echo chambers, and viral dynamics that transcend geography. The key insight: masses today are simultaneously more fragmented (everyone in their own bubble) and more unified (able to coordinate instantly around shared outrage). The psychology involves understanding how attention is captured, how identities are formed online, how beliefs spread like contagions, and how the line between individual and mass has blurred. We are all, now, part of multiple masses—some we choose, some choose us.
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