"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 seminar "Medienstadt Hamburg [Media City Hamburg]", organised by "Neue Gesellschaft e.V. [New Society]" on 28 September 2018 in Hamburg.