Social media are one of the main arenas in which European citizens discuss policy issues such as migration and in which opinion formation on such issues takes place through the sharing and consumption of information and views. At the same time, it is an arena in which traditional and alternative media, NGOs, and politicians share their views on migration and interact with citizens to promote their agenda. For this reason, social media are a melting pot of different actors and interests, and a lens through which the European discourse on migration can be studied. Social media offer both, a huge potential for, on the one side, the free and democratic exchange and, on the other, for polarization and manipulation of the European discourse on migration.