39. The system of claim 32 , wherein the ad targeting manager is further configured for computing the relevance measure comprising a relevance matrix providing relevance scores for the relevance of a given advertisement to each of the users.
40. The system of claim 39 , wherein the ad targeting manager is further configured for computing the value measure comprising a value matrix providing value scores for the value of presenting a given advertisement to each of the users, the value scores calculated based on the relevance scores.