Twitter vanishes for an hour, but was it a bug or DDoS?

For the first time in nearly a year, Twitter suffered a prolonged outage Thursday, leaving its 140 million active monthly users without micro-blogging capabilities. The San Francisco-based company announced via a tweet that the approximately hour-long disruption was due in part to a “cascaded bug in one of our infrastructure components.” But hacker collective UGNazi took responsibility for the outage, claiming it brought Twitter down through a distributed denial-of-service (DDoS) attack. UGNazi has claimed hacks and DDoS attacks on a number of organizations and most recently is believed responsible for hijacking the personal Gmail account of CloudFlare CEO Matthew Price so it could attack 4chan.