Communication and social marketing in the service of public health must be approached with the same scientific rigor as other prevention activities. The extremely rapid developments in the audiovisual landscape—driven by the convergence of information technology and media, the proliferation of screens, and their portability—offer numerous opportunities for personalized interactions, which are potential sources of effectiveness. The challenge remains to successfully integrate these efforts with on-the-ground initiatives and to leverage the capabilities of communication and social marketing not only to reach individuals and their social networks but also to help improve the places where they live. [author’s abstract]