Collective behavior provides a framework for understanding how the actions and properties of groups emerge from the way individuals generate and share information. In humans, information flows were initially shaped by natural selection yet are increasingly structured by emerging communication technologies. Our larger, more complex social networks now transfer high-fidelity information over vast distances at low cost. The digital age and the rise of social media have accelerated changes to our social systems, with poorly understood functional consequences. This gap in our knowledge represents a principal challenge to scientific progress, democracy, and actions to address global crises. We argue that the study of collective behavior must rise to a “crisis discipline” just as medicine, conservation, and climate science have, with a focus on providing actionable insight to policymakers and regulators for the stewardship of social systems.
Collective behavior historically referred to instances in which groups of humans or animals exhibited coordinated action in the absence of an obvious leader (1–4): from billions of locusts, extending over hundreds of kilometers, devouring vegetation as they move onward; to schools of fish convulsing like some animate fluid while under attack from predators; to our own societies, characterized by cities, with buildings and streets full of color and sound, alive with activity. The characteristic feature of all of these systems is that social interactions among the individual organisms give rise to patterns and structure at higher levels of organization, from the formation of vast mobile groups
— source pnas.org | Joseph B. Bak-Coleman, Mark Alfano, Wolfram Barfuss, Elke U. Weber | Jun 21, 2021