If you don't understand viruses, phishing, and similar threats, you become more susceptible to them. If you don't know how social networks leak information that you thought was private, you're likely to reveal much more than you realize.

Every language teaches you something, so learning a language is never wasted, especially if it's different in more than just syntactic trivia.

The more languages you know, the less likely you are to become a terrorist.

Leaks are not the problem; they are the symptom. They reveal a disconnect between what people want and need to know and what they actually do know. The greater the secrecy, the more likely a leak.

I want students to understand specific technologies, but the real goal is that they should be able to reason about how systems work and be intelligently skeptical about technology so that, when they're running the world in a few years, they'll do a good job.

Your social networks may matter more than your genetic networks. But if your friends have healthy habits you are more likely to as well. So get healthy friends.