The second presenter in this session at the AoIR 2025 conference is Felipe Soares, whose focus is on the Bolsonarist coup attempt in Brazil on 8 January 2022. This occurred after Bolsonaro’s close election loss in November 2022, which Bolsonaro disputed and which led his supporters to call for military intervention. By now, Bolsonaro has been sentenced to 27 years in prison for this coup attempt.

These events can be seen as a clear sign of deep-set destructive polarisation in Brazil: there is a breakdown of communication between the sides, an emotional exclusion of others, and a dismissal of information …

The final session today at the AoIR 2025 conference starts with my excellent QUT colleague Tariq Choucair, who begins by introducing the challenge of assessing polarisation: there are many different definitions of polarisation, which require different measures of assessment. Most current methods fail to sufficiently distinguish between these types of polarisation.

Tariq is therefore proposing a new approach to assessing polarisation, which he has applied to the study of national electoral contests in Australia, Brazil, Denmark, and Peru. The focus here is to identify polarising rhetoric, including campaign attacks, and polarisation in broader public debates.

The method focusses especially on …

The final speaker in this session at the AoIR 2025 conference is the brilliant Fabio Giglietto, presenting a study of pro-Bolsonaro narratives on Facebook in Brazil. The key question here is whether online hyperpartisan groups are as stable as they are thought to be; is that true, and how does such stability fare in times of intense political crisis?

Brazil is an obvious case for the study of such questions. The project tracked some 59 pro-Bolsonaro accounts between 2021 and 2023, a timeframe including Bolsonaro’s election loss against Lula and his subsequent coup attempt. The dataset contains some 12 million …

After a week spent in Brussels and at the 25th anniversary of the Center for Internet Research in Aarhus, I’ve now arrived in Hamburg for the inaugural Search Engines and Society (SEASON) 2025 conference, which begins with a keynote by the great Matthias Spielkamp, the founder of German NGO AlgorithmWatch, who is also a partner in our ARC Centre of Excellence for Automated Decision-Making and Society. His keynote reflects on the past ten years of AlgorithmWatch’s efforts to promote algorithmic accountability.

AlgorithmWatch is a non-profit NGO based in Berlin and Zürich, seeking to ensure that algorithms serve to strengthen …