Who might be the next philanthropic power couple out of Silicon Valley? Facebook's Sheryl Sandberg and her husband, David Goldberg of Survey Monkey?

"Facebook's COO Sheryl Sandberg has zoomed to fame with Lean In, but she's not the only tech heavyweight in the family. Her husband David Goldberg is the founder of Survey Monkey and earlier built a company called LAUNCH Media. Sandberg's net worth currently stands around $1 billion, while Goldberg’s net worth is up for debate. Clearly, though, there is plenty of money here, and the couple have signed the Giving Pledge." -- Sue-Lynn Moses, Inside Philanthropy