Twitter has no evidence that anyone’s passwords got stolen from an unhashed password file on their internal network that was there for a lengthy period of time … but they don’t know that none of them were.
Twitter urges all users to change passwords after glitch | Reuters
Twitter Inc urged its more than 330 million users to change their passwords after a glitch caused some to be stored in readable text on its internal computer system rather than disguised by a process known as “hashing”.
I switched my account to 2 factor authentication after it was taken over by Romanians. It took me two weeks to get it back. My Twitter password is unique, also, so nothing else was compromised, if it was compromised. I'm waiting to see if somebody else tries to log into my account. Good luck with that.