This chapter introduces postdigital citizenship as a necessary reconceptualisation of digital citizenship amid shifts in work patterns and contemporary political-economy conditions. While digital citizenship treats technology as a complementary tool for civic participation, postdigital citizenship recognises that digital mediation has become a constitutive existential condition in which boundaries between work, leisure, and political engagement have collapsed. Through critical conceptual analysis integrating immaterial labour theory, platform studies, and Actor Network Theory, we show how civic participation simultaneously constitutes unpaid affective, communicative, and cognitive labour generating platform value, while agency operates through socio-technical assemblages rather than autonomous individuals. We further demonstrate how these conditions manifest unevenly across Global South contexts, where platformisation intensifies precarisation and data colonialism. Normatively, we examine structural pathways towards democratic ownership of digital infrastructure—contrasting data-owning democracy with digital socialism—and advance four pedagogical principles shifting from individualistic towards collective, contestation-based, and prefigurative frameworks, amplifying alternatives such as platform cooperatives, data commons, and federated networks as embodied practices of postdigital citizenship.