Nike takes out adds on t v some number of people by shoes. They don't know whether the people who buy the shoes saw the ad. Nike, the web site now knows, did that ad ros clinon actually lead to a conversion? Die by ditions? And so this is why the c pc, the cast for a click, model, is powerful. It works the same on social mediab you should never be paying for impressions on social media. Should always be paying for clicks on social media, and should as hai contract, whether theyare any good or not.