An example is Mali, whose linguistic profile was explored on this blog in discussing the long-tail of languages - Bambara is certainly more used than the official French. 
Kwa mfano nchini Mali, ambapo hali ya lugha iliangaziwa kwenye blogu hii katika kutazama uzungumzaji wa lugha - Kibambara kinaonekana kuwa lugha maarufu kuliko hata lugha rasmi ya Kifaransa.