In its mainstream analysis, social ontology seems to make use of the modern idea of subjectivity. Margaret Gilbert, and David Lewis in his previous book on conventions, consider the subject as an auto transparent postulate. The thesis I will discuss in this paper is based on the idea that the ethical position outlined by Friedrich Nietzsche, which remains problematic in its positive outcomes, becomes a useful instrument for the comprehension of the pre-institutional components of the social world when applied to an entirely different and more articulate framework such as those offered by contemporary social ontologies.