Check out Afrographique by Ivan Colic (an Art Director at Ogilvy Cape Town) for some nice visuals representing data on information such as mobile phone use, facebook use, and foreign direct investment in Africa.
Example: Foreign Direct Investment In Africa
Foreign Direct Investment is the “net inflow of investment to acquire a lastming management interest (10% or more of voting stock) in an enterprise operating in an economy other than that of the investor.”
The graphic here is 100% to scale and cumulative. I’d love to see it broken down by per capita and per-investor country slices. He got his data from the 2009 World Bank Report.