This document contains notes from a presentation on social media and technology. It discusses the history and growth of digital technology and social media, moving from limited participation and distribution monopolies to today's era of user-generated content and business models based on social media. It also examines the shift to more open and participatory media, debates around the impacts of these changes, and implications for business and policy. Throughout it references experts like Marshall McLuhan and perspectives from both optimists and pessimists about social media's effects.