It seems most likely the money is going to eventually end up in a donor-advised fund, a philanthropic structure that's increasingly popular among the wealthiest people in Silicon Valley. The basic idea: You hand over your money to a nonprofit, which then manages it for you, and you tell the nonprofit to hand out donations from that fund whenever you want. Some critics of the structure argue that it allows donors to get a tax break without actually requiring them to donate all the money they put into the fun ...