If you got a password reset notice from Twitter last night or this morning, don't worry, your account wasn't hacked. When Twitter notices suspicious activity indicating that an account might have been compromised, it resets the password just to be on the safe side. That's a good thing!
But last night the system spazzed. According to the company: "We unintentionally reset passwords of a larger number of accounts, beyond those that we believed to have been compromised." So breathe easy people. Your passwords are probably safe. [Twitter via FWD]