Craig Newmark is the latest signee of the Giving Pledge. Lev Radin/Pacific Press/LightRocket via Getty Images Craig Newmark, the founder of Craigslist, is celebrating his 73rd birthday by giving his ...

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Craig Newmark's philanthropic strategy is shaped as much by what didn’t work as by what did — leading to an approach that favors scale, networks, and trusted intermediaries over scattershot giving.