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Facebook is already public, so they can sell the day it vests and get it in cold hard cash in their bank account. If Facebook weren't public it would be a more interesting point as they couldn't liquidate immediately, but they can, so I wouldn't read anything into that.

Comp is comp, no matter how it comes (though the details can vary in important ways).

I know people who've taking quite good comp from startups to do things that would require fundamental laws of physics to be invalidated; they took the money and devised experiments that would show the law to be wrong.

But maybe the salary is also higher?