The AP reports: Halftime “tweets” seem to be the latest NBA fad. Suns center Shaquille O’Neal posted a note on his Twitter feed before a home game against Washington on Saturday night, suggesting he planned to post to the popular social networking Web site during halftime. And sure enough, a brief message was posted on Shaq’s feed before the third quarter. “Shhhhhhh,” it read. It was the same message O’Neal delivered when asked about his Twitter plans before the game. When told Phoenix coach Alvin Gentry already knew about it, O’Neal bent over, leaned against the locker-room wall and groaned loudly, saying his plans were blown.