how diverse are web search results?
Search result diversification has recently gained attention as a means to tackle ambiguous queries. While query ambiguity is of particular concern for the short queries commonly observed in a Web search scenario, it is unclear how much diversity is actually promoted by Web search engines (WSEs). In this paper, we assess the diversification performance of two leading WSEs in the context of the diversity task of the TREC 2009 and 2010 Web tracks. Our results show that these WSEs perform effectively for queries with multiple interpretations, but not for those open to multiple aspects related to a single interpretation. Moreover, by deploying a state-of-the-art diversification approach based on query suggestions from these WSEs themselves, we show that their diversification performance can be further improved.
diversity web search search engines