Twitter, Tumblr, and Pinterest warn of privacy risk after customer support company Zendesk is hacked (update)

The last few weeks have seen a flood of companies being hacked or otherwise attacked online, and the latest is customer-support company Zendesk and some of its clients -- including Tumblr. In a post on its blog, Zendesk states that it discovered a hacker had accessed its systems this week, allowing information from three of the company's customers to be downloaded. The problem has since been corrected -- and an investigation is ongoing -- but Zendesk believes that the attacker was able to retrie...