2. The method of claim 1 , comprising classifying the one single search result as very relevant to the search query based on a parameter that is an observed historical click through rate associated with the one single search result, the one single search result being one of the one or more search results that are each classified as at least potentially relevant to the search query.
2. The method of claim 1 , comprising classifying the one single search result as very relevant to the search query based on a parameter that is an observed historical click through rate associated with the one single search result, the one single search result being one of the one or more search results that are each classified as at least potentially relevant to the search query. 3. The method of claim 2 , comprising calculating the observed historical click through rate as a ratio representing a total number of times users have selected the one single search result to a total number of times users have selected a second search result different from the one single search result.