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And the last speaker in this Indicators of Social Cohesion symposium is another local, Gregor Wiedemann, who is applying such Social Media Observatory approaches to the German debate about nuclear power. Nuclear energy slowly began to be phased out after the Fukushima disaster, but this has been challenged in recent times especially as a result of the energy crisis following the Russian attack on Ukraine, and some political actors are still calling for the (technologically impossible) reactivation of German nuclear power plants.

The final session of this very enjoyable Indicators of Social Cohesion symposium in Hamburg begins with our gracious host, Felix Victor Münch, introducing the Social Media Observatory (SMO) project at the Hans-Bredow-Institut and Research Institute Social Cohesion. Felix introduces this as a kind of DIY research infrastructure building effort.

The final speaker in this session at the Indicators of Social Cohesion symposium is the fabulous Annett Heft, whose focus is on patterns and dynamics of conspiracy theories (as part of the Neovex project), and especially on how these spread from the fringes to more mainstream visibility, not least also via social media.

The next speaker at the Indicators of Social Cohesion symposium is Eckehard Olbrich, whose focus is on the evidence for polarisation in the German Twittersphere. This seeks to evaluate the claims about the role of social media as a driver of polarisation, and to address the negative impacts of such polarisation if such polarisation is indeed present. Polarisation might exist at issue, ideological, or affective levels, and these levels also intersect with each other, of course.

The final panel at this excellent Indicators of Social Cohesion symposium in Hamburg starts with the excellent Jakob Ohme, whose focus is on digital intermediaries in knowledge processes on digital platforms. Such platforms lead to context collapse, a levelling of epistemically hierarchies, and a disintegration of formerly fixed sequences in the knowledge process; through this, for instance, journalism has lost its gatekeeping function and information monopoly, actors have switched roles in the information process, and the amount of unverified information that is circulating has increased substantially.

Day two at the Indicators of Social Cohesion symposium begins with the great Petter Törnberg, who begins with a brief review of the changing understanding of the public sphere. With the arrival of the Web and (later) social media, there was early optimism about a new democratic renaissance – an opportunity for more inclusive and diverse public debate after the mass mediatisation of public debate through commercial print and broadcast media.

The final speaker on this first day of the Indicators of Social Cohesion symposium is the great Luca Rossi, presenting some of the outcomes of the PolarVis project to map online debate around climate change from a visual perspective.

The next speaker at the Indicators of Social Cohesion symposium is Ethan Busby, zooming in from Utah. His focus is especially on the use of Large Language Models in research, and current research focusses especially on the analysis of conversations in social media spaces, and the potential for automated tools to interact with such conversations.

The next session at the Indicators of Social Cohesion symposium starts with the wonderful Katrin Weller, who begins by noting that her institution, GESIS, is now also launching DP-REX, the Data Portal for Racism and Right-Wing Extremism Research. But her talk is actually about assessing the impact of scientific impact through altmetric scores, with a particular focus on the engagement with scientific content that takes place in YouTube videos. The project uses data from Altmetric.com, who identified links to scientific articles in the descriptions of YouTube videos between 2006 and 2017.

The afternoon at the Indicators of Social Cohesion symposium in Hamburg starts with the excellent Lena Frischlich, who shifts our focus to the question of conspiracy theories as they circulate in transnational counterpublic spheres. The digital environment provides many opportunities for new political movements, and many of them are positive in nature, but there are also many opportunities for what Thorsten Quandt has described as ‘dark participation’.