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The act of encountering information unexpectedly has long been identified as valuable, both as a joy in itself and as part of task-focused problem solving. There has been a concern that highly accurate search engines and targeted personalization may reduce opportunities for serendipity on the Web. We examine whether there is the potential for serendipitous encounters during Web search, and whether improving search relevance through personalization reduces this potential. By studying Web searchdoi:10.1145/1518701.1519009 dblp:conf/chi/AndreTD09 fatcat:hdxg2lhgjjdafns5pxiloomttq