Twitter under cyber attack

MICRO-BLOGGING network Twitter was disabled for two hours yesterday in what appeared to be a malicious attack caused by thousands of remote-controlled PCs.<br /><br />Twitter co-founder Biz Stone said on Twitter&rsquo;s blog that the site was the victim of a denial-of-service attack, a technique in which hackers overwhelm a website&rsquo;s servers with communications requests.<br /><br />&ldquo;We are defending against this attack now and will continue to update our status blog as we continue to defend and later investigate,&rdquo; Stone wrote.<br /><br />The social networking site&rsquo;s service was restored after two hours, but the company said it was &ldquo;continuing to defend against and recover from this attack&rdquo;.<br /><br />Twitter&rsquo;s newfound fame makes it an easy target for hackers, said Steve Gibson, the president of internet security research firm Gibson Research.<br /><br />A single group could have been behind recent problems on Twitter and Facebook as hackers evolve their ability to attack multiple sites at once, Gibson said. <br /><br />When hackers stage a denial-of-service attack they use thousands of PCs to repeatedly access the site, causing it to fail.