The document discusses social media and its implications for mental health. It defines social media as being social and allowing for the creation of multi-directional relationships, as well as being media through which content is distributed electronically. It notes that with social media, people are no longer isolated, boundaries between public and private life have blurred, and things happen online 24/7. The document provides examples of social media tools and discusses how social media enables dialogue and information sharing. It also covers privacy concerns and properties of information flow on social networks like reciprocity, durability, traceability, and scalability.