Eli Pariser is a pioneer in online politics. Shortly after 9/11, he created a website calling for a non-military approach to fighting terrorism. Within weeks, over half a million people from 192 countries signed on. His website merged with MoveOn.org and Pariser—then twenty years old—joined the group to direct its foreign policy campaigns. He is currently board president of MoveOn.org. In The Filter Bubble, Pariser addresses the political and social effects of an increasingly personalized internet experience, in which the information we consume is now controlled—and limited—by customized filters.