The document provides an overview of communications technologies and social media. It discusses the rise of Twitter and how it allows users to send short text messages. It also discusses how Twitter has been used to organize protests. Facebook is introduced as a social networking service with over 1 billion active users that allows users to connect with friends and join groups. Both Twitter and Facebook have faced some criticism and controversies over blocked content and workplace bans. Overall, the document shows how new technologies are changing how people connect and organize socially.