perhaps im being naive (or biased), but why donate $500m to a SV foundation rather than say use that money to address those in more needier positions? Maybe I'm misinterpreting the 'Giving Pledge' ideals but I believe they were meaning donate to those in need for day to day life - rather than funding a community of a relatively well-off community. I understand the desire to give back to your community but 500 million can make a large dent into some bigger issues.

1st world vs. developing world problems I guess..