More than 250,000 Twitter users will be prompted to reset their Twitter password the next time they access Twitter. This is because Twitter detected a hacking attack on these account.
Hackers might have access to some Twitter users’ username, email address and encrypted/salted version of your password (not the actual letters and numbers in the password).
According to Twitter Director of Information Security, Bob Lord, the attack is not the work of amateurs hackers. It is extremely sophisticated and similar to recent attacks on other companies and organizations.
This is a good time for you to change your Twitter Password. If you reuse your password across several websites, it would be advisable to change them too.