The three editors introduce the key themes of this edited volume: migration, crisis and culture in digital networks. The chapter summarises the four parts under investigation, namely theories, case studies from Mexico, China, India and Nigeria, European crisis, and digital culture and communication shifts. In addition to explaining the rationale for the volume, this chapter puts forward the notion that the digital public sphere shapes and is shaped by debates surrounding crisis, conflict, migration and culture, forming and reforming multiple fragmented and interconnected spheres and publics.