The Ties that Bind Networks: Weak Ties Facilitate the Emergence of Collective Memories

TL;DR

This study demonstrates that early interactions through weak ties in social networks promote collective memory formation, reducing polarization and enhancing shared understanding across communities.

Contribution

It reveals the crucial role of weak ties in early communication for fostering collective memories and provides a data-calibrated model to optimize information sharing in networks.

Findings

Weak ties facilitate higher mnemonic convergence when used early.

Early bridging interactions increase information diversity and shared memories.

Model extensions predict network interventions to reduce polarization.

Abstract

From families to nations, what binds individuals in social groups is the degree to which they share beliefs, norms, and memories. While local clusters of communicating individuals can sustain shared memories and norms, communities characterized by isolated cliques are susceptible to information fragmentation and polarization dynamics. We employ experimental manipulations in lab-created communities to investigate how the temporal dynamics of conversational interactions can shape the formation of collective memories. We show that when individuals that bridge cliques (i.e., weak ties) communicate early on in a series of networked interactions, the community reaches higher mnemonic convergence compared to when individuals first interact within cliques (i.e., strong ties). This, we find, is due to the tradeoffs between information diversity and accumulated overlap over time. By using data calibrated models, we extend these findings to a larger and more complex network structure. Our approach offers a framework to analyze and design interventions in communication networks that optimize shared remembering and diminish the likelihood of information bubbles and polarization.