Mark Zuckerberg is ok in my book.   How do you spend $6B, anyway?   (Yeah, I'd like to give it a shot.)   Read on for the story.   What would you do if you had billions?

One of the world's youngest billionaires, 26-year-old Facebook founder and CEO Mark Zuckerberg, has pledged to donate at least half of his estimated $6 billion fortune to charity.

Zuckerberg, along with junk bond pioneer Michael Milken and AOL co-founder Steve Case, are among 17of America's richest people who have added their names to a growing list of the planet's wealthiest people joining the Giving Pledge, a promissory group founded by Warren Buffett and Bill Gates which seeks to get billionaires to publicly pledge large chunks of their fortunes to charity and not their heirs.

In a release on the Pledge's website, Zuckerberg explained why, among other things, he pledged $100 million to the Newark, N.J., public school system earlier this year.

"People wait until late in their career to give back. But why wait when there is so much to be done?" Zuckerberg said. "With a generation of younger folks who have thrived on the success of their companies, there is a big opportunity for many of us to give back earlier in our lifetime and see the impact of our philanthropic efforts."