From At Stanford, Zuckerberg Previews Facebook’s Future:

Stanford president John Hennessy presents Facebook CEO Mark Zuckerberg with a "NerdNation" t-shirt as a memento of his visit.
Stanford president John Hennessy presents Facebook CEO Mark Zuckerberg with a “NerdNation” t-shirt as a memento of his visit.

Stanford president John Hennessy presents Facebook CEO Mark Zuckerberg with a “NerdNation” t-shirt as a memento of his visit. Photo by Linda Cicero, Stanford News Service. Used by permission.