Facebook said they have found no evidence that their user-data was compromised and is working with their internal engineering teams, other security companies and law enforcement authorities, to learn everything about the attack, so it can prevent similar attacks in the future.
Facebook is not the only company that has been hacked recently; other popular American websites have also reported breaches of their websites and networks and are claiming that the attacks came from China.
For information about the "Java Security Bypass Zero-day" exploit, click here.
To ensure that you have the recommended version of Java installed to prevent this exploit, click here.
For more information about the Facebook hack, click here.