| Vol-532 Copyright © 2009 for the individual papers by the papers' authors. Copying permitted for private and academic purposes. Re-publication of material from this volume requires permission by the copyright owners. This volume is published by its editors.

# Recommender Systems and the Social Web

### Proceedings of the Workshop on Recommender Systems and the Social Web,
collocated with the 3rd ACM Conference on Recommender Systems (RecSys'09),
New York, USA, October 25, 2009.

Edited by

### Dietmar Jannach1
Werner Geyer2
Jill Freyne3
Sarabjot Singh Anand4
Casey Dugan5
Bamshad Mobasher6
Alfred Kobsa7

1Department of Computer Science, TU Dortmund, Germany
2IBM Research, Cambridge, MA, USA
3CSIRO, TasICT Centre, Australia
4Department of Computer Science, University of Warwick, UK
5IBM Research, Cambridge, MA, USA
6School of Computing, DePaul University, USA
7Donald Bren School of Information and Computer Sciences University of California, Irvine, USA

## Table of Contents

### Long Papers

1. Improving Recommendation Accuracy by Clustering Social Networks with Trust
   T. DuBois, J. Golbeck, J. Kleint, A. Srinivasan
2. Collaborative and Content-based Filtering for Item Recommendation on Social Bookmarking Websites
   T. Bogers, A. van den Bosch
3. Improving Folkrank With Item-Based Collaborative Filtering
   J. Gemmell, Th. Schimoler, M. Ramezani, L. Christiansen, B. Mobasher
4. A Tag Recommender System Exploiting User and Community Behavior
   C. Musto, F. Narducci, M. De Gemmis, P. Lops, G. Semeraro
5. Social Trust as a Solution to Address Sparsity-inherent Problems of Recommender Systems
   G. Pitsilis, S.J. Knapskog
6. Ontology Guided Dynamic Preference Elicitation
   G. Chamiel, M. Pagnucco
7. Augmenting Collaborative Recommender by Fusing Explicit Social Relationships
   Q. Yuan, Sh. Zhao, L. Chen, Y. Liu, Sh. Ding, X. Zhang, W. Zheng
8. Spreading Activation Approach to Tag-aware Recommenders: Modeling Similarity on Multidimensional Networks
   A. Troussov, D. Parra, P. Brusilovsky
9. The Copied Item Injection Attack
   N. Oostendorp, R. Sami

### Short papers

1. Does Trust Influence Information Similarity?
   D.H. Lee, P. Brusilovsky
2. A Holistic Approach to Enhance the Doctor-Patient Relationship for Diabetes Using Social Networking, Personalized Alerts, Reminders, and Recommendation
   W. WL Yip, L. M. Quiroga
3. Using Wikipedia Content to Derive Ontology for Modeling end Recommanding Web pages across Systems
   P.-C. Chang, L.M. Quiroga
4. Personalised Tag Recommendation
   N. Landia, S. Singh Anand
5. A Hybrid PLSA Approach for Warmer Cold Start in Folksonomy Recommendation
   A. Said, R. Wetzker, W. Umbrath, L. Hennig

### Demos

1. Cobot: Real Time Multi User Conversational Search and Recommendations
   S. Sahay, A. Venkatesh, A. Ram

Complete Workshop Proceedings (~5.8MB)

27-Oct-2009: submitted by Dietmar Jannach, Lukas Kalabis
27-Oct-2009: published on CEUR-WS.org