Jack Dorsey, CEO of Square, Chairman of Twitter and a founder of both ,holds an event in London on November 20, 2014, where he announced the launch of Square Register mobile application. The app, which is available on Apple and Android devises, will allow merchants to track sales, inventories and other data on smartphones and tablets. AFP PHOTO / JUSTIN TALLIS / AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
