The document discusses the early history and development of the internet and social media. It notes that in the 1970s, as computer networking expanded beyond the military, people began using connected computers to discuss topics of interest and reconnect with others. Early forms of the internet in the 1960s included CompuServe and the development of basic email. By the 1970s, networking technology had improved and UseNet allowed for communication through virtual newsletters. The document then provides brief descriptions of popular social media platforms that emerged in the late 20th/early 21st century like Twitter, Facebook, Instagram, YouTube, and others. It notes that social media is now an integral part of marketing and outreach for many businesses.