Eli Pariser is an online organizer and disorganizer, the former Executive Director of MoveOn (and now the board president), a co-founder of Avaaz.org, and as of May 2011 the author of The Filter Bubble. Shortly after the September 11th terror attacks, Eli created a website calling for a multilateral approach to ﬁghting terrorism. In the following weeks, over half a million people from 192 countries signed on, and Eli rather unexpectedly became an online organizer. The website merged with MoveOn.org in November of 2001, and Eli joined the group to direct its foreign policy campaigns. He led what the New York Times Magazine called the “mainstream arm of the peace movement,” tripling MoveOn’s member base in the process, and demonstrating for the ﬁrst time that large numbers of small donations could be mobilized through online engagement, and developing many of the practices that are now standard in the ﬁeld of online organizing. In 2004, Eli became Executive Director of MoveOn. Under his leadership, MoveOn.org Political Action grew to 5 million members and raised over $120 million from millions of small donors to support advocacy campaigns and political candidates.