FILE - A Twitter app icon on a mobile phone is displayed in Philadelphia, U.S.A., April 26, 2017. Elon Musk plans to change the logo of Twitter to an 'X' from the bird, marking what would be the latest big change since he bought the social media platform for $44 billion last year. (AP Photo/Matt Rourke, File) FILE PHOTOAPRIL 26, 2017, FILE PHOTO

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