Qihao Ji is Associate Professor of Communication at Marist College, USA. He teaches and conducts research on topics related to social media, media psychology, and entertainment media. His work on these subjects has appeared in various journals, including New Media & Society, International Journal of Communication, Human Communication Research, Journalism and Mass Communication Quarterly, International Journal of Press/Politics, and Media Psychology, among others.

Part 1 1. What is Social Media? 2. Social Media Users 3. Social Media Design and Affordance 4. Social Media Economy Part 2 5. Social Media and the Self 6. Social Media for Relationship Management 7. The Use of Social Media among Children and Older Adults 8. Social Media for Health and Fitness Part 3 9. Social Media for News and Information Sharing 10. Social Media for Social Movement and Political Campaign 11. Social Media Marketing 12. Social Media Entertainment and Well-being