Twitter is like alcohol for some celebrities. You can tell some are pure attention whores who need the contact, they'd wither and die in the old days of celebrity intrigue and mystery where you didn't write a tweet everytime you use the bathroom. Because of this some get ignorant, act a fool, are rude and just generally embarrass themselves. Some ruin the reputations their PR Team works so hard to cultivate: Rihanna/Chris Brown. Others reveal their own hypocrisy and basically show of their rabid crazy fans: Gaga and the bullying being done by her little monsters. Others are very smart and only use twitter for promotion or stay away from it entirely. One thing I can give Beyonce is she was smart enough to stay away from twitter.

I think Twitter will eventually die off but some celebs better rethink their marketing and how they portray themselves in the media.