I just want to add he's used tweets to manipulate stock prices before and it put the SEC on his ass. He's familiar with how making public announcements like that can come across to the law at that point. Even though he wasn't punished he knew where he the line was drawn well before he "impulsively" crossed it. Twitter was a haven for actual journalism and journalists who live by ethics knowing damn well the consequences for libel and slander. The stories they pushed had a massive influence on undoing his image and it keeps going. Same with his Saudi co investor and Larry Ellison. These guys all know what it was really worth.