In the formative years of the Internet, researchers collaboratively connected computing systems with a goal of sharing research and computing resources. The model process with which they created the Internet and its forefather, the ARPANET, was echoed in early social media platforms, where creative computer scientists, artists, writers, musicians educators explored the promise of computer-based platforms to bring together communities of interest in what would be called “cyberspace.” With a focus on the arts and humanities, this introduction traces the development of social media affordances in applications such as email, mailing lists, BBSs, the Community Memory, PLATO, Usenet, mail art, telematic art, and video communication. The author outlines the early social media platforms documented in each chapter in this book and summarizes how the book's epilogues both explore differences between early and contemporary social media and look to the future of the arts in social media.