The document discusses four stages of social movements: emergence, coalescence, bureaucratization, and decline. Social movements emerge due to persistent social problems, consensus around injustice, and failure of change mechanisms. The stages are described as emergence, popular stage, formalization, and decline through repression, co-optation, success, failure or alignment with mainstream. Later sections discuss how social media enabled citizen journalism in the Oscar Grant case and Egyptian revolution, and how these relate to the four stages model and other revolution factors like economic issues.