Why is podcast advertising so popular? For one, people can listen to them on mobile devices, so episodes can be consumed on morning commutes, during lunch and evening chores. Secondly, the number of categories and shows offer something for nearly every interest. Lastly, more than 1.4 million American podcast listeners exist today with a projected growth of 81% by 2022. You can not afford to pass on this opportunity to get your companies message in all these ears.