COO Sheryl Sandberg has acknowledged that Facebook was wrong to delete posts showing an iconic image of a naked girl fleeing a napalm attack during the Vietnam war. The admission came in a letter to Norwegian Prime Minister Erna Solberg. Facebook last week repeatedly deleted the Pulitzer Prize-winning photo, "The Terror of War," on grounds that it violated its nudity restrictions. A global firestorm over censorship ensued. The controversy began when Norwegian author Tom Egeland included the image in a post on the history of warfare.