What you'll need:
• A North Face sweater or hoodie
• Sandals
• A smug sense of superiority (optional)
If you were the inventor of Facebook, you would have invented Facebook. But even if you didn't, it's probably O.K. to dress up like Mark Zuckerberg for Halloween. You won't need the billions of dollars that the real Zuck's worth to impersonate the boy genius; all it takes is his traditional North Face and sandals combo. But how to stand out among the uncostumed college students who dress like that every day? As Jesse Eisenberg did in The Social Network, you could affect a sullen gaze and an unblinking inability to understand everyday social situations. Or you could just go around poking people.