Circle of 6 was born out of the 2011 "Apps Against Abuse" challenge, a partnership between the Office of the Vice President, Department of Health and Human Services and the White House Office of Science and Technology Policy. Kainaz Amaria/NPR hide caption

itoggle caption Kainaz Amaria/NPR

Pinterest has created a database of "things in the world that matter to human beings," says Alexis Madrigal. Pinterest hide caption

itoggle caption Pinterest

Taxi drivers protest against Uber, an on-demand car service app, during a 24-hour strike July 1 in Barcelona, Spain. They say it undercuts their business and are calling for the government to ban it. David Ramos/Getty Images hide caption

itoggle caption David Ramos/Getty Images

Customers can get a tactile experience trying on glasses at Warby Parker's shop in New York City. Elise Hu/NPR hide caption

itoggle caption Elise Hu/NPR

A 1976 Hawker Siddeley Harrier GR3 Jump Jet sold at the Silverstone Auctions Saturday for the equivalent of $179,611. Courtesy of Silverstone Auction hide caption

itoggle caption Courtesy of Silverstone Auction