In the last decade and a half, there has been an explosion of academic research as well as industrial activity seeking to organize, explore, analyze, mine, exploit and even monetize data arising from social phenomena. This space is populated by several companies and startups which leverage recommender systems, social networks, social media or combinations thereof, possibly in conjunction with traditional structured data.

Significant strides have been made by the research community in the general area of online social systems such as above. While many research issues arising in online social systems tend to have an interplay with data management and mining, the majority of the published literature has appeared mainly outside mainstream top tier "database" conferences.

This workshop is intended as a forum for researchers interested in the various aspects of online social systems to discuss and disseminate results in both foundational and pragmatic aspects of social systems. We plan to have two exciting keynotes (details to follow). We plan to keep the workshop format fairly informal, having ample room for discussions, debate and the eventual identification of new research challenges. We hope that the workshop will trigger vigorous research activity within the database community in this exciting area. We solicit papers in any of the following topics as well as other topics that may be relevant to online social systems.

Papers should be in single-spaced, two-column format in ACM SIG style (Option 1 or Option 2) up to 6 pages, including abstract, figures and bibliography, and should be submitted online through EasyChair, no later than 11:59PM, July 1st, 2012, Pacific Daylight Time.