Currently ranked at #2 position on the SN front page is a post that was Thursday's AMA. Abubakar is Nigerian, and that post as well as his profile @ank show his involvement in his bitcoin involvements:

I am Abubakar, AMA! #57767

A number of weeks ago there was another AMA of a Nigerian exchange CEO:

I am Bernard Parah, CEO of Bitnob, AMA! #40018

There are others here as well, I hope they will pipe in.