Great paper out of MSR to appear at the upcoming SIGIR conference on short-term personalization.  Specifically, it looks at when people refine their search (search again to try to find something) but at least a few of the search results would be the same as a previous search.  Do you show them again or not?  Right now, search engines ignore whether they have shown the result before recently -- they treat each search as totally independent -- but that is almost certainly the wrong thing to do.  What is the right thing to do isn't trivial, but, as this paper shows, probably is worth doing.
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