(The official British inquiry into the 7/7 attacks concluded that there was little evidence that Khan, Tanweer, and Hussain were big Internet users.) That is because the overwhelming majority of participants in social movements comprise what sociologists refer to as “free riders”—people who share the movement’s grievances, who associate with the movement’s goals, and who have absorbed the movement’s symbols into their own identities, but who do not take part in the movement’s actions.
