Networked discontent: The anatomy of protest campaigns in social media.

•Protest communication networks are fragmented in ways that hamper information diffusion.•Only a few brokers spanning structural holes activate their connections to allow information flow.•Measures of global brokerage are more important than local measures to identify pivotal actors in the exchange of information.•Online networks are not always effective mediators of collective action efforts.•A more cumulative research approach to collective action in the digital age is needed.