A recent Giving Pledge event, with (from left) Bill and Melinda Gates, Airbnb cofounder Nathan Blecharczyk, Elizabeth Blecharczyk, Airbnb cofounders Joe Gebbia and Brian Chesky, and Giving Pledge cofounder Warren Buffett (photo courtesy of Giving Pledge)
A recent Giving Pledge event, with (from left) Bill and Melinda Gates, Airbnb cofounder Nathan Blecharczyk, Elizabeth Blecharczyk, Airbnb cofounders Joe Gebbia and Brian Chesky, and Giving Pledge cofounder Warren Buffett (photo courtesy of Giving Pledge)
The three billionaire cofounders of online lodging website Airbnb, Brian Chesky, Joe Gebbia, and Nathan Blecharczyk, as well as Salesforce.com CRM -0.74% founder Marc Benioff and 13 other individuals or families, have joined the Giving Pledge, the group announced Wednesday. Members promise to give a majority of their wealth to philanthropic causes.  The Airbnb cofounders are among the youngest to sign the pledge: Chesky and Gebbia are 34, and Blecharczyk is 33.
Bill and Melinda Gates and Warren Buffett created the Giving Pledge in 2010 in an effort to spur charitable giving both in the U.S. and around the world. The Pledge now counts 154 members from 16 countries, the organization said in a statement.
“This new group joining the Giving Pledge is incredibly thoughtful about their desire to give back and help solve the world’s toughest challenges through philanthropy,” Bill Gates, co-chair of the Bill & Melinda Gates Foundation, said in a statement. “Some have been giving for decades and others are just starting out after building successful businesses, but they all see the value of giving in a bold and effective way. Melinda, Warren and I are glad to have the opportunity to learn with them and from them.”
CEO of Salesforce Marc Benioff. Photo by Mike 

Other billionaire newcomers to the Giving Pledge since June 2015 include Intuit founder Scott Cook and his wife Signe Ostby, mapping software mogul Jack Dangermond and his wife Laura, orthopedic surgeon-turned-inventor-and-investor Gary Michelson, Saudi Prince Alwaleed bin Talal, U.K. insurance mogul Henry Engelhardt, Dubai-based property tycoon P.N.C. Menon, and Indian biotech entrepreneur Kiran Mazumdar-Shaw.
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