Facebook's Zuckerberg and wife are expecting a daughter

FILE - In this Nov. 9, 2014 file photo, Priscilla Chan and Mark Zuckerberg arrive at the 2nd Annual Breakthrough Prize Award Ceremony at the NASA Ames Research Center in Mountain View, Calif. Zuckerberg and his physician wife, Chan, are expecting a baby. The co-founder of the world's largest social network used a Facebook post Friday, July 31, 2015, to announce that Chan is pregnant with a healthy baby daughter. He didn't say when the baby is due. Peter Barreras/Invision/AP