Chapter 7 examines how secondary school action groups, established by students in their respective schools, played a crucial role in mobilizing teenagers against the extradition bill by tapping into and leveraging their latent social capital. Utilizing Instagram as a platform, these groups facilitated connections among students within and across schools, often by capitalizing on their schools’ identities and leveraging various sources of social capital tied to those identities. This enabled loose and fragmented social networks can be mobilized in social movements, provided that they can activate their latent social capital.