Summary: This chapter explains the evolution of social interactions in networked space. As mobile peer-to-peer networks differ from the old-fashion centralized communication architectures, new aspects such as the principle of sharing, the transspatial and transtemporal perspective, and social aspects in the digital age are explained in detail. This chapter is not related to programming at all, but explains the changes that the communication systems will undergo in the near future towards real peer-to-peer networking in the mobile domain.