Maintenance work on the ZORA database servers is scheduled for Thursday 25th July 2019 from 19:00-20:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Rössler, Patrick; Schulz, Anne (2014). Public opinion expression in online environments. In: Donsbach, Wolfgang; Salmon, Charles T; Tsfati, Yariv. The Spiral of Silence. New Perspectives on Communication and Public Opinion. New York: Routledge, 101-118.