"Social Media als Herausforderung für Wissenschaftskommunikation und Meinungsbildung [Social Media as a Challenge for Science Communication and Opinion Formation]", talk by J.-H. Schmidt in the context of the "ScienceBrunch 27: Wissenschaftskommunikation - "must" oder "nice-to-have"? [ScienceBrunch 27: Science Communication - "must" or "nice-to-have"?]" organised by the Klima- und Energiefonds on 14 December 2017 in Zurich, Switzerland.