New opportunities of social and economic relationships offered by evolving information and communication technologies have become in the ’90 the subject of research projects and studies carried on with the support of international and national agencies. In particular, the diffusion of multimedia and pervasive equipments in daily life, has also questioned issues related with the conception and perception of trust, security and privacy that individuals and groups develop while using pervasive- or also defined ubiquitous - technologies. On one side, such technologies, if compared to the more established ones, can strengthen social control and nurture processes of social differentiation. On the other side, the use of pervasive technologies could improve and modify patterns of behaviour that coordinate communications and interactions among colleagues or collaborators. The problems linked with the treatment of personal data and in particular ethical issues have also increased with the developments of data collection concerning multiple dimensions of personal interactions. The papers debates these aspects and their privacy implications with empirical examples from studies concerning networks of communication among peers inside different types of organizations (education, research institutes, enterprises).