** FILE ** Facebook CEO Mark Zuckerberg speaks during a "fireside chat" at a conference organized by technology blog TechCrunch in San Francisco on Tuesday, Sept. 11, 2012. Mr. Zuckerberg updated his Facebook status on Thursday, Oct. 4, 2012, to announce that the social networking site has more than 1 billion active users each month. (AP Photo/Eric Risberg)
Josh Moore, 10, holds a rifle his father gave him for his 11th birthday, at their home in Carneys Point, N.J. The Moore family claims this photo, posted on Facebook, led the state’s child welfare agency to the family’s house, Friday, March 15, 2013, demanding to be let inside to inspect their guns. (AP Photo/Shawn Moore)
Josh Moore, 10, holds a rifle his father gave him for his 11th birthday, at their home in Carneys Point, N.J. The Moore family claims this photo, posted on Facebook, led the state’s child welfare agency to the family’s house, Friday, March 15, 2013, demanding to be let inside to inspect their guns. (AP Photo/Shawn Moore)
In this 2013 photo provided by Tiger Woods and Lindsey Vonn, golfer Tiger Woods and skier Lindsey Vonn pose for a portrait. Two months after rumors began circulating in Europe, Woods and Vonn posted separate items on their Facebook pages Monday, March 18, 2013, to announce their relationship. (AP Photo/Courtesy Tiger Woods/Lindsey Vonn)
In this 2013 photo provided by Tiger Woods and Lindsey Vonn, golfer Tiger Woods and skier Lindsey Vonn pose for a portrait. Two months after rumors began circulating in Europe, Woods and Vonn posted separate items on their Facebook pages Monday, March 18, 2013, to announce their relationship. (AP Photo/Courtesy Tiger Woods/Lindsey Vonn)
In this 2013 photo provided by Tiger Woods and Lindsey Vonn, golfer Tiger Woods and skier Lindsey Vonn pose for a portrait. Two months after rumors began circulating in Europe, Woods and Vonn posted separate items on their Facebook pages Monday, March 18, 2013, to announce their relationship. (AP Photo/Courtesy Tiger Woods/Lindsey Vonn)
In this 2013 photo provided by Tiger Woods and Lindsey Vonn, golfer Tiger Woods and skier Lindsey Vonn pose for a portrait. Two months after rumors began circulating in Europe, Woods and Vonn posted separate items on their Facebook pages Monday, March 18, 2013, to announce their relationship. (AP Photo/Courtesy Tiger Woods/Lindsey Vonn)
Facebook CEO Mark Zuckerberg speaks at company headquarters in Menlo Park, Calif., on Thursday, March 7, 2013. Mr. Zuckerberg unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses. (AP Photo/Jeff Chiu)
Facebook CEO Mark Zuckerberg speaks at company headquarters in Menlo Park, Calif., on Thursday, March 7, 2013. Mr. Zuckerberg unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses. (AP Photo/Jeff Chiu)
