According to a blog posted by the social network on Friday, the security team of Facebook discovered the attempts meant to attack Facebook's systems last month. It was a sophisticated attack and occurred when a few employees visited a mobile developer website that was compromised, said Facebook. However, Facebook has said to find no evidence that shows any Facebook user data to be compromised by the malware. The malware was installed on the computer of everyone who visited the website in question.

Facebook further added that the infected systems were installed with latest versions of anti-virus software. Soon after the malware was detected all the affected systems were recuperated and the law enforcement was informed.

Facebook said that there are a few unnamed companies hit by this attack. "We immediately took steps to start sharing details about the infiltration with the other companies and entities that were affected". Moreover, Facebook has said to work together through an informal working group and other ways on this incident.

Despite Facebook said not to have compromised on user data, Twitter has revealed that "unusual access patterns" on its network indicates that data of 250,000 users might have been accessed by attackers. Private companies and government will be allowed by the legislation to share information about cyber attacks.