Twitter recently sent out password resets to accounts that were suspected of being high-jacked. Twitter has diagnosed the cause of this issue to be sites with security exploits that share the same username and password as your Twitter account.

"The takeaway from this is that people are continuing to use the same email address and password (or a variant) on multiple sites... We strongly suggest that you use different passwords for each service you sign up for."

Read the post from Twitter for complete details on the Twitter Password Reset.

Be secure, be safe, be smart.