SUN VALLEY, ID - JULY 10: Sheryl Sandberg, COO of Facebook, and her husband David Goldberg arrive for morning session of the Allen & Co. annual conference at the Sun Valley Resort on July 10, 2013 in Sun Valley, Idaho. The resort is hosting corporate leaders for the 31st annual Allen & Co. media and technology conference where some of the wealthiest and most powerful executives in media, finance, politics and tech gather for weeklong meetings. Past attendees included Warren Buffett, Bill Gates and Mark Zuckerberg. (Photo by Kevork Djansezian/Getty Images)

SUN VALLEY, ID - JULY 10:  Sheryl Sandberg, COO of Facebook, and her husband David Goldberg arrive for morning session of the Allen & Co. annual conference at the Sun Valley Resort on July 10, 2013 in Sun Valley, Idaho. The resort is hosting corporate leaders for the 31st annual Allen & Co. media and technology conference where some of the wealthiest and most powerful executives in media, finance, politics and tech gather for weeklong meetings. Past attendees included Warren Buffett, Bill Gates and Mark Zuckerberg.  (Photo by Kevork Djansezian/Getty Images)