Psychologists say it’s the next big addiction – kids spending up to seven hours a day on smartphones and tablets. One South African company is turning this potential problem into a tool for academic excellence. Top Dog today is one of Africa’s largest ed-tech companies. They have over three and a half million users and what they are doing is fundamentally changing the way millions of people learn so that they can acquire the knowledge to shape their future. The company is growing at an average of 4000 new subscribers weekly. It offers a broad spectrum of supplementary on-line lessons.