Twitter Data Breach (2013)

Online attackers were able to access the usernames, email addresses, session tokens, and encrypted passwords of 250,000 users. Twitter notified affected users and told them to create a new password. Anyone who used the same password and username or email combination for other sites is encouraged to change the password on other sites as well.UPDATE (03/11/2013): Facebook, Microsoft, and Apple were all affected by a similar breach around the same time.