document: Mobile search pattern evolution : the trend and the impact of voice queries In this paper we study the characteristics of search queries submitted from mobile devices using Yahoo ! Search for Mobile during a 2 months period in early of 2010 , and compare the results with a similar study conducted in late 2007 . The major findings include 1 ) mobile search queries have become much more diverse , and 2 ) user interest and information needs have been substantially changed at least in some areas of search topics , including adult and local intent queries . In addition we investigate the impact of voice query search interface offered by Yahoo ! 's mobile search service . We examine how unstructured spoken queries differ from conventional search queries .
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