#16 Mark Zuckerberg and Priscilla Chan

The Facebook founder and Priscilla began dating before the social networking site had gone public. Priscilla recently graduated from the medical school at the University of California, San Francisco, she plans to become a pediatrician. (In that, she seems to be following in the path of other notable Silicon Valley spouses who have their own established careers, like Laurene Powell Jobs.) On December 9, 2010, Zuckerberg, Bill Gates, and investor Warren Buffett signed a promise they called the "Giving Pledge", in which they promised to donate to charity at least half of their wealth over the course of time, and invited others among the wealthy to donate 50% or more of their wealth to charity.

#15 Sheryl Sandberg and David Goldberg

Facebook's No. 2 in charge, Sheryl Sandberg is married to the CEO of SurveyMonkey, David Goldberg, the popular online survey site that just landed a whopping $800 million investment from several sources. SurveyMonkey is a web survey development cloud based (SaaS) company, founded in 1999 by Ryan Finley.

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