Twitter HACKED, Security Attacks On The US Continue
As a precautionary security measure, the company reset passwords and revoked session tokens for these accounts. If your account was one of them, you will have recently received (or will shortly) an email from us at the address associated with your Twitter account notifying you that you will need to create a new password. Be warned, however, that these same hackers may try to send fake e-mails that look like this legitimate one in order to phish for account information.
Even more frightening is that Twitter doesn't think this is an isolated attack, and notes that whoever is behind this clearly has the skills to get the information they crave. Even if your account isn't compromised, you might want to change and strengthen your password just to be safe.