Companies frequently like to teach the virtues of online security through Capture the Flag competitions, where you're encouraged to both create hacks and protect against them. Developing those competitions isn't always easy. However, Facebook is giving trainers an upper hand: it's open sourcing the code for its own CTF platform, letting anyone host a similar cybersecurity challenge or build on what Facebook has learned. The move should be particularly useful for companies and schools that want to demonstrate the importance of closing security holes and otherwise running a tight ship -- you can't afford sloppy code if you want to win.