Zuckerberg announced that he and wife Priscilla had welcomed their second child last week, with a heartfelt letter. "August, we love you so much and we're so excited to go on this adventure with you," he wrote. "We wish you a life of joy, love and the same hope you give us."
Zuckerberg and Priscilla are already parents to 1-year-old daughter Max. See more on the family in the video below.