Abstract: Online social media are a major venue of public discourse today, hosting the opinions of hundreds of millions of individuals. Social media are often credited for providing a technological means to break information barriers and promote diversity and democracy. In practice, however, the opposite effect is often observed: users tend to favor content that agrees with their existing world-view, get less exposure to conflicting viewpoints, and eventually create “echo chambers” and increased polarization. Arguably, without any kind of moderation, current social-media platforms gravitate towards a state in which net-citizens are constantly reinforcing their existing opinions. In this talk we present a ongoing line of work on analyzing and moderating online social discussions. We first consider the questions of detecting controversy using network structure and content, tracking the evolution of polarized discussions, and understanding their properties over time. We then address the problem of designing algorithms to break filter bubbles and reduce polarization. We discuss a number of different strategies such as user and content recommendation, as well as viral approaches.

Speaker: Aristides Gionis

Affiliation: Professor of Computer Science, Aalto University

Place of Seminar: Aalto University