Inside Facebook's Cyber-Security System

An anonymous reader writes "The Facebook Immunity System (FIS) processes and checks 25 billion actions every day, or 650,000 actions every second. The social networking giant's cybersecurity system was developed over a three-year period to keep the service's users safe from spam and cyberattacks. FIS scans every click on Facebook for patterns that could suggest something malicious is spreading across the social network."