Here’s a great article in the New York Times detailing the lack of internet infrastructure in Africa:
Attempts to bring affordable high-speed Internet service to the masses have made little headway on the continent. Less than 4 percent of Africa’s population is connected to the Web; most subscribers are in North African countries and the republic of South Africa.
A lack of infrastructure is the biggest problem. In many countries, communications networks were destroyed during years of civil conflict, and continuing political instability deters governments or companies from investing in new systems. E-mail messages and phone calls sent from some African countries have to be routed through Britain, or even the United States, increasing expenses and delivery times. About 75 percent of African Internet traffic is routed this way and costs African countries billions of extra dollars each year that they would not incur if their infrastructure was up to speed.