Mark Zuckerberg, wife Priscilla Chan welcome second daughter

Facebook CEO Mark Zuckerberg and wife Priscilla Chan on Monday announced the birth of their second daughter and named her August. Zuckerberg shared a letter addressed to the newborn which read, "We'll do everything we possibly can to make sure the world is a better place for...all children in your generation." The couple had their first daughter, Max, in 2015.