Manuel Castells writes sociology about cities, communication, technology and the structure of networked societies. The Information Age trilogy, beginning with The Rise of the Network Society, examines how digital networks reshape economies, organisations, identity and politics. The City and the Grassroots focuses on urban social movements, while Communication Power looks at media networks and political influence. Castells's work is large-scale, empirical and theoretically ambitious, moving between institutions, technology and collective action. Useful discovery terms include digital society, urban sociology, globalisation and the political effects of communication networks. Read more Less