Facebook Chief Executive Mark Zuckerberg speaks to employees during the company’s Hackathon in Menlo Park California, in this May 17, 2012 handout photo courtesy of Facebook. Facebook holds a hackathon every few months, where staff members build prototypes for new ideas they have. Photo taken May 17, 2012. REUTERS/Francis Luu/Facebook (UNITED STATES – Tags: BUSINESS) NO ARCHIVES. NO SALES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS