We solicit unpublished research papers that address various aspects of online social network based collaborative applications. Topics of interest include, but are not limited to:

• Models of privacy and security related to collaborative social networks and social networks
• Social network analysis and mining for collaborative applications
• Access control models and solutions for collaborative social networks
• Studies of user needs and behaviors for various collaborate applications in social networks
• Business models for collaborative social networks
• Trust and Reputation models in collaborative applications
• Knowledge-base management in collaborative social networks
• Interoperability issues in social networks
• Semantic technologies for collaborative social networks
• Decentralized architectures for collaborative social networks