'The FP Twitterati 100' - where are the Africans?

The magazine Foreign Policy has put together something they call 'The FP Twitterati 100' - A who's who of the foreign-policy Twitterverse in 2011. Check it out here.

Neat it is, but what puzzled me instantly was the very few Africans on the list.

Paul Kagame is put in the category 'Politicians and Diplomats', and titled 'President of Rwanda and Twitter fanatic' (!)

However, in the 'Africa' category only one out of five, namely Andrew Mwenda from Uganda, is an African.

And the reason can't be that Africans are not tweeting.

However, having followed the Tanzanian twittersphere since it developed I suspect that one reason for not reaching out to a European or American ordience may be that tweeps tend to be very much in love with internal issues (where foreigners either need lots of insight or patience), and that language is Kiswahili mixed with English?