Mark Zuckerberg, wife Chan pledge 99% of their Facebook shares to charity as they welcome their first child together!

Facebook founder Mark Zuckerberg and his wife Priscilla Chan have welcomed a baby girl, Max into the world!

Announcing the birth, the happy couple wrote a letter to their daughter giving away 99% of their shares in the company to charity.

''Priscilla and I are so happy to welcome our daughter Max into this world! For her birth, we wrote a letter to her about the world we hope she grows up in,'' Mark announced on his Facebook page.

''As you begin the next generation of the Chan Zuckerberg family, we also begin the Chan Zuckerberg Initiative to join people across the world to advance human potential and promote equality for all children in the next generation. Our initial areas of focus will be personalized learning, curing disease, connecting people and building strong communities,'' Mark and Priscilla wrote. ''We will give 99% of our Facebook shares — currently about $45 billion — during our lives to advance this mission. We know this is a small contribution compared to all the resources and talents of those already working on these issues. But we want to do what we can, working alongside many others.''

The entire letter to Max is quite lengthy. You can read it in full over on Facebook.

Congrats Mark and Chan!