The importance of Ut's 1972 photograph cannot be underestimated. The image was instrumental in exposing to the rest of the world what was happening in Vietnam. Some argue, including Ut himself, that this photograph alone was a turning point in the conflict. The photograph galvanized opposition to the war.

But this week, Facebook decided that the image breached the social network's terms of service. Facebook banned a user who published the photograph, and then subsequently ordered a newspaper to also remove the photograph from its Facebook page, sparking uproar over the social network's control of media.

Today, Facebook has deleted a further post featuring the photograph by Norwegian Prime Minister Erna Solberg, who joined in on the swelling debate regarding the censorship of the photograph. Solberg was one of many politicians who decided to share the image in the wake of the original incident.