The Changing Face of Web Search
             Prabhakar Raghavan, Yahoo! Research

Web search has come to dominate our consciousness as a convenience we
take for granted, as a medium for connecting advertisers and buyers,
and as a fast-growing revenue source for the companies that provide
this service. Following a brief overview of the state of the art and
how we got there, this talk covers a spectrum of technical challenges
arising in web search - ranging from social search to auction design
and incentive mechanisms.