In this video, Motley Fool contributor Steve Heller explores what has made eBay (EBAY -0.63%) a mobile powerhouse in the age of smartphones and what will drive future returns for shareholders. Most notably, Brazil, Russia, India, and China will continue to dominate growth, as 80% of the next 2 billion Internet users coming online in the next three to five years will come from these countries. In the context of mobile, the majority of these users will experience the Internet for the first time on a mobile device, putting eBay's mobile business in an envious position compared to the competition -- namely, Facebook (META -2.29%) and Google (GOOGL 1.60%).