This chapter provides a timeline and overview of major developments in communication technologies from early writing systems to modern social media. It discusses 7 milestones: printing, telegraph/telephone, photography/film, radio/TV, digital media, mobile media, and social media. Each new technology conquered space and time, facilitating the spread of ideas and information to more people. They created cultural icons, changed how people spend leisure time, and increased opportunities for self-expression and mass communication. The greatest impacts are often unintended new applications rather than direct replacements of old technologies.