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Julie Jacobson, Associated Press
FILE - In this July 9, 2011, file photo, Mark Zuckerberg, president and CEO of Facebook, walks with Priscilla Chan during the 2011 Allen and Co. Sun Valley Conference, in Sun Valley, Idaho.
We want you to grow up in a world better than ours today. —Mark Zuckerberg, Facebook CEO

SAN FRANCISCO — Facebook CEO Mark Zuckerberg and his wife announced the birth of their daughter Max as well as plans to donate most of their wealth, or roughly $45 billion, to a new organization that will tackle a broad range of the world's ills.

Zuckerberg's wife, Priscilla Chan, gave birth last week to a baby girl. The couple didn't put out the news until Zuckerberg posted it Tuesday on — of course — Facebook.

Priscilla and I are so happy to welcome our daughter Max into this world!For her birth, we wrote a letter to her about...Posted by Mark Zuckerberg on Tuesday, December 1, 2015

In the same post, Zuckerberg said he and Chan will commit 99 percent of their Facebook stock to such causes as fighting disease, improving education, harnessing clean energy, reducing poverty and promoting equal rights. They are forming a new organization, called the Chan Zuckerberg Initiative, to pursue those goals.