Facebook's Mark Zuckerberg and his wife Priscilla Chan say they will give away 99% of their shares in the company to good causes as they announce the birth of their daughter Max.
Mr Zuckerberg made the announcement in a letter to Max on his Facebook page.
He said they are donating their fortune to the Chan Zuckerberg Initiative because they want to make the world a better place for Max to grow up in.
The donation amounts to $45bn (£30bn) at Facebook's current value.
However the shares will not be donated to charity immediately, but over the course of the couple's lives.
Were Mr Zuckerberg to give away 99% of his shares immediately, he would still possess hundreds of millions of dollars. Ms Chan's worth has not been documented.
Max was born last week, although her birth was only made public on Tuesday.
In his letter Mr Zuckerberg said the aim of the Chan Zuckerberg Initiative is "to advance human potential and promote equality for all children in the next generation".
Its initial areas of focus will be personalised learning, curing disease, connecting people and building strong communities.
"Your mother and I don't yet have the words to describe the hope you give us for the future," Mr Zuckerberg said at the start of his letter to Max.
"You've already given us a reason to reflect on the world we hope you live in," it added.
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Dave Lee, BBC North America Technology Reporter, San Francisco
Billionaire investor Warren Buffet congratulated Zuckerberg and Chan, proclaiming that when it comes to giving away your fortune, "30 is the new 70".
No longer should billionaires wait to die before handing over money to a different generation, Buffet said, in a gushing approval of Silicon Valley's newest and most influential power couple.
Everything Mark Zuckerberg does is eyed with intense scrutiny, not least due to the nature of Facebook's business of making money from personal data.
But while the 31-year-old's previous charitable efforts have been criticised for being too focused on building Facebook's user base, this latest pledge appears to leave the Facebook business to one side.
It's a continuation of what we've seen developing over the past six months, where Zuckerberg appears at ease hosting heads of state as he does in the company of his own development team.
The days of Mark Zuckerberg being seen as a nerdy, awkward tech dork are well behind us.
His ambition now is clearly to be a significant figure on the global political stage.
Read more: Silicon Valley's new power couple
The letter highlighted the important role of technology in achieving the couple's goals of advancing human potential and equality.
"Many of the greatest opportunities for your generation will come from giving everyone access to the internet," Mr Zuckerberg wrote to his daughter.
ของเฟสบุ๊คมาร์กซักเคอร์เบิร์กและภรรยาปริสเซลาจันทร์กล่าวว่า พวกเขาจะให้ไป 99% ของหุ้นในบริษัทดีสาเหตุพวกเขาประกาศการเกิดของลูกสาวของพวกเขาสูงสุดนาย Zuckerberg ทำการประกาศในจดหมายกับสูงสุดบนหน้าเฟสบุ๊คของเขาเขากล่าวว่า พวกเขาจะบริจาคชะตากับริ Zuckerberg จันทร์เนื่องจากพวกเขาต้องการให้โลกดีกว่าสำหรับสูงสุดเติบโตในยอดเงินบริจาค $45bn (£30bn) มูลค่าปัจจุบันของ Facebookอย่างไรก็ตาม หุ้นจะไม่สามารถบริจาคกุศลทันที แต่ในช่วงชีวิตของทั้งคู่มีนาย Zuckerberg จะให้ 99% หุ้นของเขาทันที เขาจะยังคงมีนับร้อยล้านดอลลาร์ มีการจัดทำเอกสาร Ms จันทร์คุ้มไม่สูงสุดเกิดสัปดาห์ที่ แม้ว่าเธอเกิดเฉพาะทำสาธารณะในวันอังคารในจดหมายของเขา นาย Zuckerberg กล่าวว่า เป้าหมายของนวัตกรรมนี้ Zuckerberg จันทร์จะ "ก้าวหน้าศักยภาพมนุษย์ และส่งเสริมความเท่าเทียมกันสำหรับเด็กทุกคนในรุ่นต่อไป"จะเป็นส่วนของพื้นที่เริ่มต้นของความเรียนรู้ รักษาโรค เชื่อมต่อคน และสร้างชุมชนเข้มแข็ง"แม่และไม่ได้มีคำอธิบายความหวังที่คุณให้แก่เราในอนาคต นาย Zuckerberg กล่าวที่จุดเริ่มต้นของตัวอักษรของเขาให้สูงสุด"คุณได้แล้วให้เราเหตุผลถึงบนโลกเราหวังว่า คุณอาศัยอยู่ใน มันเพิ่มที่ Zuckerberg ควรใส่เงินของเขาCellan-โจนส์: วิธีซักเคอร์เบิร์กละเว้นคำแนะนำของฉัน (อย่างชาญฉลาด)Dave Lee, BBC North America Technology Reporter, San FranciscoBillionaire investor Warren Buffet congratulated Zuckerberg and Chan, proclaiming that when it comes to giving away your fortune, "30 is the new 70".No longer should billionaires wait to die before handing over money to a different generation, Buffet said, in a gushing approval of Silicon Valley's newest and most influential power couple.Everything Mark Zuckerberg does is eyed with intense scrutiny, not least due to the nature of Facebook's business of making money from personal data.But while the 31-year-old's previous charitable efforts have been criticised for being too focused on building Facebook's user base, this latest pledge appears to leave the Facebook business to one side.It's a continuation of what we've seen developing over the past six months, where Zuckerberg appears at ease hosting heads of state as he does in the company of his own development team.The days of Mark Zuckerberg being seen as a nerdy, awkward tech dork are well behind us.His ambition now is clearly to be a significant figure on the global political stage.Read more: Silicon Valley's new power coupleThe letter highlighted the important role of technology in achieving the couple's goals of advancing human potential and equality."Many of the greatest opportunities for your generation will come from giving everyone access to the internet," Mr Zuckerberg wrote to his daughter.
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