One of the national sports commentators I listen to said (and I'm paraphrasing):"Why would I want to be on Twitter? It doesn't get you raises or increase your popularity. All it does is give you the opportunity to get fired for saying something offensive or stupid." It's a very true statement because people interpret things differently and with how everyone nowadays is thin skinned and overly sensitive, people with bold opinions should stay far away from Twitter. If you're famous and have a Twitter account, let an intern or assistant handle it.