Facebook boss Mark Zuckerberg and his wife are welcoming a new daughter in a post - where else - on Facebook.
Zuckerberg and Priscilla Chan already have a toddler daughter, Max, born in 2015. They named their second child August.
The couple posted a photo of the family on Monday, along with a letter they wrote to August hoping she will get to enjoy her childhood.
They write "childhood is magical", saying she only gets to be a child once "so don't spend it worrying too much about the future".
Chan and Zuckerberg also wrote a letter to Max when she was born, talking about the world they hope to see her grow up in, with advances in science, medicine and access to education.
