TEXT: A candy dispenser decorated as a double-decker London bus is displayed at Facebook's new headquarters, designed by Canadian-born American architect Frank Gehry, at Rathbone Place in central London on December 4, 2017.         Social media titan Facebook opened a new office in London on December 4, 2017, that is set to be its biggest engineering hub outside America, the company has announced. / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)