Third-party access analyzed by Facebook; hackers did not access other sites that use its login

Facebook Inc said on Tuesday that its investigators have determined that hackers did not access other sites that use the social networking site's single sign-on in a massive cyber attack that the company disclosed on Friday.

"We analyzed third-party access during the time of the attack we have identified. That investigation has found no evidence that the attackers accessed any apps using Facebook Login," said Guy Rosen, a Facebook vice president overseeing security.