Sentences with phrase «shrinking ad units»

Many ruses are used by unscrupulous websites to defraud advertisers such as stacking ads on top of each other so that only the top impression is seen by website visitors but all of them earn revenue, shrinking ad units down to a 1 x 1 pixel size and placing hundreds on a page so they will be paid for the impressions even though no - one will see them or buying bot traffic from ad networks, thereby earning a healthy profit margin on the resulting ad impressions.