2. The method of claim 1 , further comprising: mapping a particular query to at least one targeting category; and presenting, on a computer display, the subject advertisement on the page, the subject advertisement selected on the basis of the value of the click probability.
2. The method of claim 1 , further comprising: mapping a particular query to at least one targeting category; and presenting, on a computer display, the subject advertisement on the page, the subject advertisement selected on the basis of the value of the click probability. 3. The method of claim 2 , wherein the mapping is performed using only an association between a query and at least one of a history of clicks.