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.
Hargittai, Eszter; Karaoglu, Gökçe (2018). Biases of online political polls: Who participates? Socius: Sociological Research for a Dynamic World, 4:1-7.