This article introduces the idea of philosophical sociology as an enquiry into the relationships between implicit notions of human nature and explicit conceptualizations of social life within sociology. Philosophical sociology is also an invitation to reflect on the role of the normative in social life by looking at it sociologically and philosophically at the same: normative selfreflection is a fundamental aspect of sociology's scientific tasks because key sociological questions are, in the last instance, also philosophical ones. For the normative to emerge, we need to move away from the reductionism of hedonistic, essentialist or cynical conceptions of human nature. Sociology needs equally to grasp the conceptions of the good life, justice, democracy or freedom whose normative contents depend on more or less articulated conceptions of our shared humanity rather than on strategic considerations. The idea of philosophical sociology is then sustained on three main pillars and I use them to structure this article: (1) a revalorization of the relationships between sociology and philosophy; (2) a universalistic principle of humanity that works as a major regulative idea of sociological research, and; (3) an argument on the social (immanent) and pre-social (transcendental) sources of the normative in social life. As invitations to embrace posthuman cyborgs, nonhuman actants and material cultures proliferate, philosophical sociology offers the reminder that we still have to understand more fully who are the human beings that populate the social world. The crisis of trust in several of our major social institutions over the past few years put puzzling questions to sociology. The press, the police, parliament, the Catholic church, banks and rating agencies are all functionally specific and, because of that, they are entrusted with the protection and indeed promotion of values that are central to their societal contribution: independent and trustworthy information, civil protection, representation and decisionmaking, moral guidance, safeguarding our private assets. In most cases, the procedures that should have prevented institutional misbehaviours were in place and were well known by the individuals concerned. Citizens and social scientists are equally concerned with why the values that society reasonably expected were being protected were rather being knowingly eroded by the guardians themselves.
KeywordsRather troublingly for us in sociology, however, these are not instances of anomie, dedifferentiation or iron cages. As I see it, our challenge is twofold. First, one underlying common theme to all these crises refers to the problematic location of the normative in social life. They demonstrate that, despite its fragility, the normative is not mere idealistic talk because the functional performance of these institutions was undermined by the neglect of their normative duties to the rest of society. The normative is not the central sphere of social life -it arguably never was -but nor is it possible to conceptu...