I have noticed a trend now. In Sub-Saharan Africa, the entry points are usually either of these three countries: Kenya, Nigeria and South Africa as far as tech businesses are concerned. Sometimes the order can take any form, could start with either of the three.
What factors determines where they start, and where they go next, because if a company hits East Africa, they probably do Kenya and Uganda, then head west for Nigeria and probably Ghana. Why not Tanzania, Zambia, Ethiopia, Zimbabwe? Is it the age old internet access and other infrastructure only?