The relationship between politics and digital media is currently a focus of intense interest: the symbiosis between the two spheres is such that political activity is now almost inseparable from media communication. However, the implications of this development are not fully understood. Digital media are a powerful tool in the hands of mainstream parties, but also make it easier than ever before for the public to express their reactions, or for new actors to enter the political arena. This volume explores the intersection between politics and new media, which involves crucial ideals, values and aspirations, such as informed democracy, citizens' empowerment and social debate, but also negative aspects like manipulation and polarization.