This article deals with the realism and the value of regulatory activities of the users of cyberspace. With a prospect of legal analysis, the study defines the cyberspace and weigh up its impact on the effectivity of traditional State laws. It then aims at explaining how the result of self-regulation activity, expressed through informal rules, could be considered as the normative balance of State laws. The demonstration embraces both definition and recognition of the characteristics and sources of the informal rules, just as the assessment of their effects and the glance that legislators and judges carry there. It opens, finally, on the prospects for this approach of co-regulation.