Who gives to crowdfunding campaigns? How much do they give? And what are the best practices of organizations that are successful during events like #GivingTuesday? We researched the answers to these questions for Craig Newmark, founder of craigslist and craigconnects. We interviewed leaders of the biggest crowdfunding platforms, like Causes, CauseVox, FirstGiving, Razoo, and StayClassy to unearth the keys to success, and help other nonprofits excel at crowdfunding.