Twitter Attacked by 'Iranian Cyber Army'

Twitter, the Web wunderkind with a $1 billion valuation, was attacked Thursday night by a group calling itself the "Iranian Cyber Army." The cyber attack was an alarming injection of apparent geopolitics onto the world's biggest social messaging service. The hackers, who took over Twitter's website for several hours, left a somewhat incoherent message that seemed to threaten the U.S.