Eli Pariser is the former executive director of MoveOn.org, which at five million members is one of the largest citizens' organizations in American politics, and now sits on the board. He's currently the CEO of Upworthy.com, a new site focused on spreading ideas that matter online. In his renowned book The Filter Bubble: What the Internet Is Hiding from You, Pariser reveals how personalization undermines the Internet's original purpose as an open platform for the spread of ideas.