Internet users are no more only conten t consumers, but also content provider. Citizens, individually or as a group, have now the possibility of easily diffusing data and information, coming from official sources and often intended to be kept confidential or re stricted. This can promote the transparency in the relationship between public organiza tions and citizens. To make it possible, subjects not directly interested in the process of information diffusion, like the service providers, must be engaged. They come then in the position to promote or hamper this phenomenon, and consequently the transparency. On this background, this paper uses agency theory to i nvestigate the “Cablegate” case involving WikiLeaks, that gained widespread global attention for the diff usion of documents unveiling the activities of the US diplomacy.