Problem: Rewrite Ads have always been targeted towards specific consumer segments. In the past, marketers have employed TV and radio preferences, survey responses, and focus groups to try to ascertain people's likely responses to campaigns. At best, these methods amounted to educated guesswork. Today, advertisers buy or gather huge quantities of data to identify what consumers actually click on, search for, and "like." Marketing campaigns are also monitored for effectiveness using click-through rates, views, and other precise metrics.