In a blog post yesterday, Twitter has stated that they have been hit by a cyberattack and that approximately 250,000 user accounts have been compromised. A a precaution they have reset the passwords and revoked session tokens for the affected accounts.
After detecting unusual activity on their networks, they identified unauthorized access attempts to Twitter user data. They were able to shut down one live attack moments after it began, but further investigation indicated that the attackers may have gotten access to about 250,000 usernames, e-mail addresses, session tokens and encrypted and salted passwords.
The attack was not just some script kiddies having fun as Twitter stated;
This attack was not the work of amateurs, and we do not believe it was an isolated incident. The attackers were extremely sophisticated, and we believe other companies and organizations have also been recently similarly attacked. For that reason we felt that it was important to publicize this attack while we still gather information, and we are helping government and federal law enforcement in their effort to find and prosecute these attackers to make the Internet safer for all users.
As a precautionary measure you may want to reset your Twitter password even if your account was not one of the ones affected. Especially if you use that password in more than one place. This is interesting as it comes right on the heels of other large media companies being hacked.