Introduction / Christina Neumayer, Mette Mortensen and Thomas Poell -- PART I. Spatiality. 1. I post, you rally, she tweets... and we all occupy: the challenges of hybrid spatiality in the Occupy Wall Street mobilizations / Alice Mattoni -- 2. Rethinking networked solidarity / Sky Croeser -- 3. Nomads of cyber-urban space: media hybridity as resistance / Emiliano Treré -- PART II. Temporality. 4. (Social) media time, connective memory and activist television histories: the case of TV Stop (1987-2005) / Tina Askanius -- 5. Facebook's communication protocols, algorithmic filters, and protest: a critical socio-technical perspective / Lorenzo Coretti and Daniele Pica -- 6. Social media as activist archives / Christina Neumayer and David M. Struthers -- Part III. Platformization. 7. Teorizing civic engagement and social media: the case of the "refugee crisis" and volunteer organizing in Sweden / Julie Uldam and Anne Kaun -- 8. Materiality of clouds: beyond a platform-specific critique of contemporary activism / Stefania Milan -- 9. "Please leave my news feed alone": exploring user protest against algorithmic personalization / Martina Skrubbeltrang Mahnke -- 10. Evolving digital repertoires of contention in transitional societies: the case of China / Jun Liu -- Afterword: Lessons and puzzles in studying social media materialities and protest / Alexandra Segerberg and W. Lance Bennett

1. Social media -- Social aspects