I think it does, because with many of these companies you're granted X shares vesting over 4 years and if the share price causes you to drop below your total "t

I think it does, because with many of these companies you're granted X shares vesting over 4 years and if the share price causes you to drop below your total "target comp" they issue you more shares to make up for it, so it's an additional grant out of FBs pocket.