An improved system and method for ranking search results using social information is provided. A social information ranking engine may be provided to rerank a list of URLs of web pages in search results from a search engine using social information. To do so, the search query may be applied to a social information domain and a second list of references to web pages may be obtained as search results. A dimensional vector of users with the plurality of terms may be constructed using search results from social information domain, and a similarity measure may be computed between the references to web pages obtained from search results by the search engine and the references to web pages obtained from search results by the social information ranking engine. The score from the similarity measure may then be used to rerank the list of references to web pages.