I think that this is just a measure of how much guilt he feels he has to alleviate, after making all that money on something as crappy and bizarre as Facebook.
In any event, it's just more publicity isn't it...?
If I gave away 10 billion of my 20 billion, I wonder if I'd still be able to live comfortably?
More importantly, I think we should work on making sure bank execs and stock brokers, don't get their hands on large sums of money in the first place.
JOKE ALERT: I think it was "J. Baresford Tippton"....http://en.wikipedia.org/wiki/The_MillionaireI faintly remembers there was someone (in US i think) who gave away all his wealth few years ago; but I can't remember that guy's name, may be Captain can help us?