Africans are also human and like any other human, they can benefited by bitcoin big time. The first thing they can have using bitcoin, is the financial security. Bitcoin can be earned using many ways like signature campaign, trading or mining. Even though mining has become much expensive now, but they can mine any other altcoins and sell it for bitcoin in any exchange. So these methods can give anyone a financial security by providing an alternate profession. So they don't have to be dependent on a job and its salary. I think this is the most positive impact of bitcoin society as a whole. People are earning from their home without have to look for a job outside. So bitcoin is supporting the society financially what many governments have failed to provide.