A computer hacker briefly hijacked Twitter.com on Thursday, redirecting users to a website and claiming to represent a group calling itself the Iranian Cyber Army.
Twitter, which in June became a key communication channel for Iranian protesters disputing the country’s election results, said it was disrupted for a little more than an hour.
Twitter’s home page was replaced with one whose headline read “This site has been hacked by Iranian Cyber Army” and an anti-American message.
“The motive for this attack appears to have been focused on defacing our site, not aimed at users,” Twitter said on its blog. “We don’t believe any accounts were compromised.”
Security experts said it was the first time attackers have succeeded in hijacking a major social-networking website.

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