BARCELONA, SPAIN - FEBRUARY 22: Founder and CEO of Facebook Mark Zuckerberg waves as he arrives for a keynote conference on the opening day of the World Mobile Congress at the Fira Gran Via Complex on February 22, 2016 in Barcelona, Spain. The annual Mobile World Congress hosts some of the world's largest communications companies, with many unveiling their latest phones and wearables gadgets. (Photo by David Ramos/Getty Images)
