A hacker accessed Zendesk info that was online. triplet clients who utilization Zendesk to store information had user lists downloaded by the hacker. Users who contacted those clients for livelihood may make had their email addresses and the topic lines of those email addresses accessed.UPDATE (02/22/2013): Tumblr, Twitter, and Pinterest were the affected clients. twitter allow users know that emails, phone numbers, twitter usernames, and any other information that was provided to twitter may have been exposed. Passwords were not compromised.