Interesting that he's going to start giving away shares now. Makes me wonder if he doesn't see much more financial upside to FB, at least at current price levels.

If there's a lot more value to to accrue to his FB stock (even on a time-discounted basis), wouldn't he want to rationally wait for the future value of those shares to materialize to have maximum impact?

Alternatively he could just think that the value to society of funding the right causes (in his mind) is just that much greater than the time-discounted future value.