Amazon.com has announced that during some sort of routine account security monitoring, the company discovered a large cache of usernames and passwords on the Internet that were reused for Amazon.com accounts. Since the scope and nature of this data has yet to be disclosed, it is highly advisable that everyone change his/her Amazon.com password and enable two factor authentication on this account.

This incident underscores the importance of not re-using passwords. Remember: a shared password means it just takes one compromise to make all your accounts with that password vulnerable to attack.

More information about this disclosure is available at: https://nakedsecurity.sophos.com/2016/10/11/amazon-finds-cache-of-reused-passwords-change-yours-now/