In an unprecedented development, toward the end of the event, Zuckerberg called on stage Microsoft's MSFT chairman, Bill Gates. Lauding Chan and Zuckerberg's philanthropic efforts, Gates was quoted saying "It's a magical time to bring this group together to tackle these problems, what's been most fun is meeting people who are optimistic that these problems can be solved. They are inspiring a whole new generation of philanthropists to do great things."