Started in 2010, the Giving Pledge now includes 168 wealthy individuals and couples from 21 countries.
These entrepreneurs bucked convention and still achieved success.
The secrets to success ?
The U.S. has lost its crown as the country with the most billionaires.
The most expensive divorce in history may soon become the most expensive divorce reduction in history.
Not bad for someone who was out of work a few years back!
There is no shortage of hypesters and hucksters offering the "secret" to getting rich.
Despite rising staff costs Newcastle United have recorded their highest ever profit of £18.7 million while debt is also down at the Premier League club.
The world economy is going through a rough patch, yet the world's billionaire population is at an all-time high.
More billionaires have been born in New York City than in any other city in the world, according new research by U.K.-based luxury magazine Spear's and research company WealthInsight.