This Chapter is about the use of the Internet and the Web 2.0 media in Italy for the professional and public response to the A/H1N1 virus pandemic. In first place we analyse the role of different surveillance tools, such as the periodic survey Passi or the network of “sentinel” doctors Influnet. All the data collected were immediately communicated to Italian and international professionals and decision makers with existing canals, as the website EpiCentro, or with on line media created on purpose, as the weekly report Flunews. Then we consider the on line formation of doctors and other professionals, implemented specifically for the pandemic emergency, with the course FluFad. Finally, we analyse how the public opinion evolved during the crisis in Italy, with particular attention to the new importance of the Web 2.0 media.