Attack on one user brings down Twitter

"Twitter's outage yesterday was caused by a coordinated denial of service attack against a single user. The denial of service (DDoS) attack that yesterday disabled micro-blogging service Twitter could have been targeted at a single anti-Russian blogger. The Tbilisi-based user, Cyxymu, was targeted in a coordinated DDoS attack that struck at his Twitter, Facebook, and YouTube services, according to Facebook's chief of security Max Kelly." - Information Age