Countering Misinformation on Social Networks Using Graph Alterations

TL;DR

This paper proposes an optimization-based method to selectively remove user connections in social networks, effectively reducing misinformation spread while preserving correct information dissemination.

Contribution

It introduces a probabilistic dropout technique optimized via convex programming to alter network dynamics against misinformation.

Findings

Reduces misinformation cascade size by up to 70% in synthetic networks.

Decreases misinformation spread by up to 45% in real Twitter-based networks.

Maintains a branching ratio of at least 1.5 for correct information.

Abstract

We restrict the propagation of misinformation in a social-media-like environment while preserving the spread of correct information. We model the environment as a random network of users in which each news item propagates in the network in consecutive cascades. Existing studies suggest that the cascade behaviors of misinformation and correct information are affected differently by user polarization and reflexivity. We show that this difference can be used to alter network dynamics in a way that selectively hinders the spread of misinformation content. To implement these alterations, we introduce an optimization-based probabilistic dropout method that randomly removes connections between users to achieve minimal propagation of misinformation. We use disciplined convex programming to optimize these removal probabilities over a reduced space of possible network alterations. We test the algorithm's effectiveness using simulated social networks. In our tests, we use both synthetic network structures based on stochastic block models, and natural network structures that are generated using random sampling of a dataset collected from Twitter. The results show that on average the algorithm decreases the cascade size of misinformation content by up to $70\%$ in synthetic network tests and up to $45\%$ in natural network tests while maintaining a branching ratio of at least $1.5$ for correct information.