Not all-cash, rather mostly cash. They do have banks, but think of banking as a luxury in those economies, not a commodity. They're for well established busines

Not all-cash, rather mostly cash. They do have banks, but think of banking as a luxury in those economies, not a commodity. They're for well established businesses and the rich. For everybody else, banks can be really tedious to deal with. So unless they have the means, people tend to just avoid the hassle. Even simply opening a bank account can be prohibitive, forget about getting a credit card, even prepaid. There's a variety of independent institutions that provide some services to fill the gaps. For example, telecom companies are often used as a medium to send money. There are also smaller, third-party or local financial service providers (formal and informal), that are more convenient for the short term, day-to-day way of life in these places. They can offer small loans, micro-financing, money transfer, and a number of other devices. And yes, currently they're the ones people generally go through to make purchases over the Internet. Fees are not always competitive. One typical approach people understand very well in a day-to-day economy is the preloaded cards. For small amounts (think 20$ or less) people can go to their telecom card provider and purchase some fbcoins. But that's not the hard part of the equation. The hard part is to get the other side (the developed world) to recognize the fbcoin. This is what's at play here and now. If Facebook can show to the world, "look, Netflix and YouTube can now take your money", they'd have won a huge part of the battle.