Drawing on the Hong Kong case of Occupy Headquarters between 30 August and 8 September 2012, this chapter examines how public support was engendered through the movement’s social media activities. It aims to enhance our understanding of how various forms of public engagement manifested in the current networked environments in response to the student protest. Although much research tends to focus on the technical affordances of digital media in social movements, this chapter invokes the concept of ‘movement scene’ to analyze the cultural and experimental dimensions of social media use underpinning the public’s self-joining efforts and discusses their impact on the student protest. As revealed in the analysis, the clusters of social media activities that characterized the public’s networked activism can be seen as joint practices of scene making, with digitally enabled individuals and groups involved in creative and networked forms of countercultural support of Occupy Headquarters. In turn, the co-creation of movement scenes provided frames of reference and movement structures for wider public engagement and sparked a series of popular protests that ignited a citywide campaign for the movement in Hong Kong.