"Zwischen Partizipationsversprechen und Algorithmenmacht. Wie soziale Medien unsere Meinungsbildung prägen [Between the Promise of Participation and the Power of Algorithms. How Social Media Impacts Our Opinion Formation]", lecture by J.-H. Schmidt at the "Fachsymposium Neue Medien und Psyche [Symposium on New Media and Psyche]", which is organised by the cantonal psychiatry service St. Gallen on 25 October 2018 in Zurich.