Although the claim was that the account was hacked, A more likley scenario is that the account was phished and the password was released to the hacker.
Security Blogger, Roger Thompson, explians that it make more sense that the account was phished. He goes on to say that it was probably the same passwod to many other accounts. No reason to blame twitter.
Is twitter really the bad guy?
Come on people, you kow better than to give out your password to anyone. Oh, and please use a different password for different sites. If you don't , then dont blame the big internet site if your account gets broken into.
Secure those passwords