The present chapter provides a conceptual framework for the newest digital communication tools and for the practices they encourage, stressing the communication opportunities they offer and the limitations they impose. In this chapter, Internetbased communication technologies are regarded as the most recent step in the development of communication technologies. This approach helps have a broad perspective on the changes information and communication technologies (ICT) are bringing along in the social practices of so called knowledge society. As a matter of fact, these changes need to be considered within an “ecological” approach, that is, an approach that provides a very wide overview on the whole context (both in synchronic terms and in diachronic ones) where ICT are spreading. In the second part of the chapter, the authors present two examples of relevant social practices that are challenged by the most recent ICT, namely journalism (news market) and Internet search engines.