The practice of audience segmentation has been taken to new heights in recent years by programmatic media buyers who use ever more precise targeting tools to refine audiences. They overlap targeting filters by time of day, geography, recent search behavior, sites visited, credit worthiness, and where a consumer falls in the purchase funnel. Ecommerce and B2B marketers, in particular, may work with audiences of a few hundred or a few thousand, which may be small but highly engaged and highly profitable audiences.

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