"Zwischen Partizipationsversprechen und Algorithmenmacht. Wie das Internet Informationssuche und Meinungsbildung verändert [Between Promise of Participation and Power of Algorithms. How the Internet Changes Information Behaviour and Opinion Formation]", keynote by J.-H. Schmidt at the "Hardehausener Medientage" organised by "YOUPAX" on 26 January 2018 in Hardehausen.