# Modeling echo chambers and polarization dynamics in social networks

## TL;DR

This paper presents a social network model that explains how echo chambers and polarization emerge through radicalization dynamics influenced by social influence and topic controversialness, aligning with empirical Twitter data.

## Contribution

The study introduces a novel model incorporating radicalization and heterogeneity, providing insights into the mechanisms behind social media polarization and echo chamber formation.

## Key findings

- Model reproduces Twitter polarization patterns
- Radicalization driven by social influence and topic controversialness
- Explains emergence of echo chambers in social networks

## Abstract

Echo chambers and opinion polarization recently quantified in several sociopolitical contexts and across different social media, raise concerns on their potential impact on the spread of misinformation and on openness of debates. Despite increasing efforts, the dynamics leading to the emergence of these phenomena stay unclear. We propose a model that introduces the dynamics of radicalization, as a reinforcing mechanism driving the evolution to extreme opinions from moderate initial conditions. Inspired by empirical findings on social interaction dynamics, we consider agents characterized by heterogeneous activities and homophily. We show that the transition between a global consensus and emerging radicalized states is mostly governed by social influence and by the controversialness of the topic discussed. Compared with empirical data of polarized debates on Twitter, the model qualitatively reproduces the observed relation between users' engagement and opinions, as well as opinion segregation in the interaction network. Our findings shed light on the mechanisms that may lie at the core of the emergence of echo chambers and polarization in social media.