22. The computer-readable storage medium of claim 21 , wherein the step of generating a click graph comprises generating a click graph depicting at least one third layer relationship between the first query and the second query in the plurality of queries, the third layer relationship indicating that each of the first and second queries has at least one of a first layer relationship and a second layer relationship to the third query.
22. The computer-readable storage medium of claim 21 , wherein the step of generating a click graph comprises generating a click graph depicting at least one third layer relationship between the first query and the second query in the plurality of queries, the third layer relationship indicating that each of the first and second queries has at least one of a first layer relationship and a second layer relationship to the third query. 24. The computer-readable storage medium of claim 22 , wherein the step of evaluating the at least one pair of queries comprises: computing a numeric value representing a degree of the at least one third layer relationship; and designating the queries in the at least one pair of queries as related based on: at least one of the computed value representing the degree of the at least one second layer relationship and the computed value representing the degree of the at least one third layer relationship being greater than zero; and the temporal distance being below a threshold value.