As people entrust social networks with more and more personal information, games that leverage those networks face security risks we seldom needed to consider five years ago. Threat modeling is a process for developing, describing, evaluating and preventing those risks. It's been used to improve the security of major operating systems, but is still simple enough to use on 99-cent smartphone games. Using real-world examples, this lecture will teach you the threat modeling process and how to use it to make your apps more secure.