Description: The Social and News Media Misinformation Workshop MEDIATE aims to bring together media practitioners and technologists to discuss new obstacles and opportunities that arise in the modern era of information diffusion. Particular emphasis will be given to interdisciplinary interactions that enable participants to assess the current state of play and outline future challenges. The theme for MEDIATE-2020 is misinformation, i.e., inaccurate or incomplete information that heavily permeates our day-to-day news consumption.