| 2009 | FriendSensing: recommending friends using mobile phones. | Daniele Quercia, Licia Capra |
| 2009 | A partial-order based active cache for recommender systems. | Umar Qasim, Vincent Oria, Yi-fang Brook Wu, Michael E. Houle, M. Tamer zsu |
| 2009 | Critiquing recommenders for public taste products. | Pearl Pu, Maoan Zhou, Sylvain Castagnos |
| 2009 | Conceptual recommender system for CiteSeerX. | Ajith Kodakateri Pudhiyaveetil, Susan Gauch, Hiep Phuc Luong, Josh Eno |
| 2009 | Recommending new movies: even a few ratings are more valuable than metadata. | Istvn Pilszy, Domonkos Tikk |
| 2009 | Using twitter to recommend real-time topical news. | Owen Phelan, Kevin McCarthy, Barry Smyth |
| 2009 | Collaborative filtering for social tagging systems: an experiment with CiteULike. | Denis Parra, Peter Brusilovsky |
| 2009 | Pairwise preference regression for cold-start recommendation. | Seung-Taek Park, Wei Chu |
| 2009 | Recommendations with prerequisites. | Aditya G. Parameswaran, Hector Garcia-Molina |
| 2009 | Experimental comparison of pre- vs. post-filtering approaches in context-aware recommender systems. | Umberto Panniello, Alexander Tuzhilin, Michele Gorgoglione, Cosimo Palmisano, Anto Pedone |
| 2009 | Learning to recommend helpful hotel reviews. | Michael P. O'Mahony, Barry Smyth |
| 2009 | Applying relevant set correlation clustering to multi-criteria recommender systems. | Nkechi Nnadi |
| 2009 | Donation dashboard: a recommender system for donation portfolios. | Tavi Nathanson, Ephrat Bitton, Kenneth Y. Goldberg |
| 2009 | How does high dimensionality affect collaborative filtering? | Alexandros Nanopoulos, Milos Radovanovic, Mirjana Ivanovic |
| 2009 | FeedbackTrust: using feedback effects in trust-based recommendation systems. | Samaneh Moghaddam, Mohsen Jamali, Martin Ester, Jafar Habibi |
| 2009 | Recsys'09 industrial keynote: top 10 lessons learned developing deploying and operating real-world recommender systems. | Francisco J. Martin |
| 2009 | Collaborative prediction and ranking with non-random missing data. | Benjamin M. Marlin, Richard S. Zemel |
| 2009 | Learning to recommend with trust and distrust relationships. | Hao Ma, Michael R. Lyu, Irwin King |
| 2009 | A spatio-temporal approach to collaborative filtering. | Zhengdong Lu, Deepak Agarwal, Inderjit S. Dhillon |
| 2009 | View-based recommender systems. | Fabin P. Lousame, Eduardo Snchez |
| 2009 | Latent dirichlet allocation for tag recommendation. | Ralf Krestel, Peter Fankhauser, Wolfgang Nejdl |
| 2009 | Understanding the effect of adaptive preference elicitation methods on user satisfaction of a recommender system. | Bart P. Knijnenburg, Martijn C. Willemsen |
| 2009 | Harnessing the power of "favorites" lists for recommendation systems. | Maryam Khezrzadeh, Alex Thomo, William W. Wadge |
| 2009 | Personalized recommendation based on the personal innovator degree. | Noriaki Kawamae, Hitoshi Sakano, Takeshi Yamada |
| 2009 | Matching information content with music. | Marius Kaminskas |