As new parents to a baby girl, the Zuckerbergs have made a groundbreaking pledge to their daughter and to the future of the world.

Zuckerberg Chan family
Credit: Mark Zuckerberg/Facebook

In the most shareable news of the day, Facebook founder Mark Zuckerberg and his wife Priscilla Chan have welcomed a baby girl, Max. Time to update their status to parents!

Not surprisingly, the couple announced their news in an open letter on Facebook. "Your mother and I don't yet have the words to describe the hope you give us for the future. Your new life is full of promise, and we hope you will be happy and healthy so you can explore it fully. You've already given us a reason to reflect on the world we hope you live in," it reads.

The letter continues: "While headlines often focus on what's wrong, in many ways the world is getting better. Health is improving. Poverty is shrinking. Knowledge is growing. People are connecting. Technological progress in every field means your life should be dramatically better than ours today. We will do our part to make this happen, not only because we love you, but also because we have a moral responsibility to all children in the next generation."

The rest of the letter is a call to action to address problems like disease, poverty, and hunger both for Max's future, and that of all children. And how they pledge to accomplish their goals to better the world is straight out of Bill and Melinda Gates' playbook: Zuckerberg and Chan say they will give away 99 percent of their Facebook shares, estimated to be worth $45 billion, to "advance human potential and promote equality for all children in the next generation."

The Gates released this statement in response: "As for your decision to give back so generously, and to deepen your commitment now, the first word that comes to mind is: Wow. The example you're setting today is an inspiration to us and the world. We can be confident of this: Max and every child born today will grow up in a world that is better than the one we know now. As you say, 'seeds planted now will grow.' Your work will bear fruit for many decades to come."

The letter ends, "Max, we love you and feel a great responsibility to leave the world a better place for you and all children. We wish you a life filled with the same love, hope and joy you give us. We can't wait to see what you bring to this world."

Talk about pressure!

Congratulations to the new parents. And Mark, we hope you "like" your two months of paternity leave!

Melissa Willets is a writer/blogger and a mom. Follow her on Twitter (@Spitupnsuburbs), where she chronicles her love of exercising and drinking coffee, but never simultaneously.