The Giving Pledge is a campaign started by Bill Gates, Melinda Gates, and Warren Buffet, intended to establish a norm of charitable giving by the ultra wealthy. Though the pledge has no enforcement, it still seems a wise way for billionaires to attempt avoiding being at the wrong end of pitchforks.
Supervillain Peter Thiel is trying a different route, and is apparently attempting to convince signers to renege on their commitments.
