65% your second point, 25% your third point, 8% your fourth point and 2% your first point. (First point maybe higher in terms of number of publishers but not in

65% your second point, 25% your third point, 8% your fourth point and 2% your first point. (First point maybe higher in terms of number of publishers but not in terms of number of advert impressions across the internet) (My %s are obviously non-scientific.)