Query log data for ad targeting
A WWW2006 paper out of Microsoft Research, "Finding Advertising Keywords on Web Pages" (PDF), claims that query log data is particularly useful for ad targeting.
Specifically, the researchers extracted from MSN query logs the keywords some people used to find a given page. They tested using that as one of many features for ad targeting. In their results, it was one of the most effective features.
Very interesting. It has always been harder to target ads to content than to search results because intent is much less clear.
By using the query log data in this way, the researchers were effectively using the intent of the searchers that arrived at the page as a proxy for the intent of everyone who arrived at the page.
C. Cattuto, D. Benz, A. Hotho, and G. Stumme. Proc. Intl. Semantic Web Conference, volume 5318 of LNAI, page 615--631. Berlin/Heidelberg, Springer, (2008)
E. Gabrilovich, and S. Markovitch. Proceedings of the 20th international joint conference on artificial intelligence, 6, page 12. Morgan Kaufmann Publishers Inc., (2007)
M. Strube, and S. Ponzetto. Proceedings of the National Conference on Artificial Intelligence, 21, page 1419. Menlo Park, CA; Cambridge, MA; London; AAAI Press; MIT Press; 1999, (2006)
H. Li, and N. Abe. Proceedings of the 17th international conference on Computational linguistics-Volume 2, page 749--755. Association for Computational Linguistics, (1998)
D. Milne, and I. Witten. Proceeding of AAAI Workshop on Wikipedia and Artificial Intelligence: an Evolving Synergy, page 25--30. AAAI Press, (July 2008)
D. Bollegala, Y. Matsuo, and M. Ishizuka. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 757--766. New York, NY, USA, ACM, (2007)
R. Baeza-Yates, and A. Tiberi. KDD '07: Proceedings of the 13th ACM SIGKDD international conference on Knowledge discovery and data mining, page 76--85. New York, NY, USA, ACM, (2007)
Q. Zhao, S. Hoi, T. Liu, S. Bhowmick, M. Lyu, and W. Ma. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 543--552. New York, NY, USA, ACM Press, (2006)