For example, setting up separate campaigns for different states may make sense if certain ads work better in one state than another. (blog.kissmetrics.com)
Once you understand the results of your ad campaigns, you may begin to notice a trend in your audience base that can show you whether or not certain ads are working. (rismedia.com)
It goes without saying that many of these complaints likely have nothing to do with certain ads no longer playing. (canadianbusiness.com)