Facebook claims its Social Verification system is collusion-proof, contradicting what University of Illinois security researchers claimed after they were apparently able to hack the system.

If you’re in the habit of forgetting your passwords, Facebook will run you through a gauntlet of security systems, ultimately in the hopes of preventing account break-ins. But how much can you really trust Facebook’s security? The answer might surprise you.

How Secure Is Facebook’s Social Verification System? – All Facebook