Though I expect the solutions aren't the same as in the west. I think at least one of the reasons that Google is in several countries is to cover support in many timezones (from talking to them) but the timezones in that area are already well covered by Europe.
One of the problems in Africa as a market is that there is less than 1% broadband penetration and reliable electricity still only reaches 5%: http://appfrica.net/blog/2008/08/16/the-current-state-of-int...
Apple's products are surely too expensive for the vast majority in Africa, the products can be sold there but it doesn't mean they need offices there.
Google, Yahoo and Facebook need more computers there or to expand more into to mobile there.