These days, every celebrity and their mom is tweeting ... And most likely from a smart phone. But not Miley Cyrus. The singer/actress, who will celebrate her 19th birthday later this month, has declared a semi-leave from Twitter -- or at least cutting down her social media usage to make more time for herself. Also on Twitter, Wiz Khalifa made big promises with his tweets, swearing that his next album will have his best songs yet. Elsewhere, Ashley Tisdale was getting in the Christmas spirit with the help of Justin Bieber, Dia Frampton of 'The Voice' was hoping for a P90X miracle and formerly little Romeo was thanking his lucky stars for his extended education. See what your favorite stars were tweeting about today!