It is our great pleasure to welcome you to the 1st ACM SIGMM International Workshop on Social Media -- WSM'09. This workshop aims to be the premier forum for presentation of research results and experience reports on leading edge issues of social media research, including models, systems, applications, and theory. The mission of the workshop is to share novel ideas, methods and techniques that address the emerging challenges of social media research and identify new directions for future research and development. WSM gives researchers and practitioners a unique opportunity to share their perspectives with others interested in the various aspects of social media.
The call for papers attracted 20 submissions from Asia, Europe, and the United States. The program committee accepted 12 papers that cover a variety of topics, including social media analysis on social networks, social media tagging, event detection and summarization from social media, and emerging applications with social media. In addition, the program includes a keynote speech by Ramesh Jain on "Influence of Multimedia in Emerging Social Web Systems", and a panel discussion on "Emerging Challenges in Social Media Research". We hope that these proceedings will serve as a valuable reference for social media researchers and developers.