Microblogging site Twitter went offline for a while Friday after hackers calling themselves the Iranian Cyber Army apparently managed to change DNS records, redirecting traffic to another Web page.Instead of the usual Twitter Web site design, visitors to the site instead saw a black screen with an image of a green flag and Arabic writing. The defaced site also included a message that said, "This site has been hacked by Iranian Cyber Army," and an e-mail address.

Twitter blamed the outage on changes made to the company’s DNS (Domain Name System) records, which match the company’s domain name with the IP addresses of its servers.

According to TechCrunch, the attack happened at about 10PM, and those responsible left a message stating:
Iranian Cyber Army
THIS SITE HAS BEEN HACKED BY IRANIAN CYBER ARMY
iRANiAN.CYBER.ARMY@GMAIL.COM
U.S.A. Think They Controlling And Managing Internet

By Their Access, But THey Don’t, We Control And Manage Internet By Our Power, So Do Not Try To Stimulation Iranian Peoples To….
NOW WHICH COUNTRY IN EMBARGO LIST? IRAN? USA?
WE PUSH THEM IN EMBARGO LIST
Take Care.

"Twitter’s DNS records were temporarily compromised but have now been fixed. We are looking into the underlying cause and will update with more information soon," Twitter said on its Twitter Status page.