Research on the study of the Internet in China mainly focuses on issues at the macro level, like state control, democracy or human rights. Few studies have examined the role of the Internet in collective contention from the experiences of individual users. Guided by theories of contentious politics and based on the empirical data collected from interviews with homeowner activists and forums of homeowners in Shanghai, this paper examines the role of the Internet in homeowners collective resistance, particularly on its contributions to the mobilisation and identification of political opportunities in such movements.