What is the fine-grained topic of the following text: According to Mort Greenberg, founder and vice president of sales at FitAd, currently the majority of FitAd’s advertisers, including Amtrak, are from the platform’s “programmatic seeds.” “We have more than 100 demand partners that plug in our platform and we are able to select certain ads and move to that environment,” Greenberg explains. Only return the topic.
FitAd's advertising strategy and partnerships