Well, I also don't understand what difference or significance it has, whether any RPi's are used in Africa. - BUT - I live in Africa, and am aware of numerous people using RPi's. I am currently running a RPi model B as a nzb and torrent downloader as well as a small web server. I also have an RPi 2 B, which I am waiting to receive, which I intend making into an audio server/player.
So yes, there are people in Africa who use RPi's - we appreciate computers, that use very little power, as much as anybody else, if not more so.