1. Do we need to rethink EU politics in the social media era? An introduction to the volume; Mauro Barisione and Asimina Michailidou -- 2. Social Media, Personalisation of News Reporting, and Media Systems’ Polarisation in Europe; Pablo Barberá, Cristian Vaccari and Augusto Valeriani -- 3. Engaging with European Politics through Twitter and Facebook: Participation beyond the National?; Micha…