User queries in search engines and Websites give valuable information on the interests of people. In addition, clicks after queries relate those interests to actual content. Even queries without answers imply important missing synonyms or content. In this talk we show several examples on how to use this information to improve the performance of search engines, to recommend better queries, and to improve the information scent of the content of a Website.

Bio:Ricardo Baeza-Yates is Director of Yahoo Research Latinamerica in Santiago, Chile and Yahoo Research Barcelona. During 2005 he was an ICREA Professor at Universitat Pompeu Fabra in Barcelona. He also was a professor and director of the Center for Web Research, that he founded in 2002, at the CS department of the University of Chile, where he was the chairperson in the period 1993-5 and 2003-4. His research interests include information retrieval, algorithms, and information visualization. He is co-author of the book Modern Information Retrieval, published in 1999 by Addison-Wesley, as well as co-author of the 2nd edition of the Handbook of Algorithms and Data Structures, Addison-Wesley, 1991; and co-editor of Information Retrieval: Algorithms and Data Structures, Prentice-Hall, 1992