Zendesk says no passwords stolen, but advises caution
                                
                                
                                    (Newser) -
                                    Twitter, Pinterest, and Tumblr are all scrambling to deal with a security breach, after a hacker accessed their customer support company and stole email addresses and other information, reports  Mashable . Zendesk, the customer service company, said it detected the hack this week, took steps to close the vulnerability, and notified...