Recently, Mark Zuckerberg joyfully announced on Facebook that he and his wife, Priscilla Chan, are expecting a daughter. More solemnly, he added that Chan had experienced three miscarriages before this pregnancy. He shared this personal story as a gesture of support and solidarity with other couples facing similar difficulties. It had meant a lot to him when his friends who had struggled to have children shared their experiences, and now it was his turn. Zuckerberg’s Facebook