Personalized Search
2002 - 2007
Numerical Algorithms for the scalable computation of a customized ranking of the web for every search user.
Social Text Mining
2005 - present
Data mining, information extraction, and data visualization systems for sentiment analysis on the social web.
Social Search
2007 - present
Models in information retrieval that seek to find the right person, rather than the right document, to answer a user's information need.
Peer-to-Peer Search
2003 - 2005
Algorithms, social and market mechanisms, and peer-level protocols for search in distributed networks.
Natural Language Learning
2001 - 2003
Probabilistic models for text mining and document clustering, and their implication towards algorithms and interfaces in search.
