(FILES) This file photo taken on September 11, 2013 shows the logo of social networking website 'Twitter' is displayed on a computer screen in London. Twitter announced May 24, 2016 it was easing its 140-character limit for tweets, allowing users to add links, attachments and some other features within the short messages. The move comes as Twitter's efforts to increase its user base and engagement have been sputtering, raising questions about its growth trend. / AFP PHOTO / LEON NEALLEON NEAL/AFP/Getty Images
