The Facebook founder and CEO, Mark Zuckerberg, and his wife, Priscilla Chan, have just announced the birth of their first child, a daughter named Max. Procreation has apparently turned Zuckerberg’s thoughts towards his legacy. In ‘A letter to our daughter’ posted (where else?) on his Facebook page, Zuckerberg explains that he and Chan want their daughter to ‘grow up in a better world than ours today’. The post was ‘liked’ by more than a million people, including Melinda Gates, Shakira and Martha Stewart. In response to Facebook COO Sheryl Sandberg’s congratulations, Zuckerberg wrote that Max ‘is clearly going to be a Lean In girl!’, referring to Sandberg’s 2013 handbook for women who aspire to be CEOs.