[alnayyir]

Both responses you got were more or less correct, sorry for the jargon. I'm a programmer by trade and passion so I figured most would suss it out, I'll have to watch how much time I spend around people that work in finance in future.

Some minor details:

I want to bet that Facebook is worth way less than people think it is, as in the other responses.

The idea I had in mind doesn't require any liquid ownership in Facebook, but rather that people would bet against me. (Derivative/future, not equity)

Which I think they're silly enough to do.