With this first issue dedicated to exploring Politics after Networks we launch spheres: journal for digital cultures. The journal is run by an editorial collective based at the Centre for Digital Cultures, Leuphana University of Lüneburg, and is supported by an international advisory board. It engages in contemporary, historical and emerging discussions concerning digital cultures and explores the social, cultural and political stakes at play by reassembling key concepts such as public spheres, media spheres and atmospheres. The journal invites exchanges between scholars, policy makers, media artists, activist and hackers, and offers a space where solicited contributions (after a first peer review) are openly reviewed through invited comments.