I guess that a playful/game approach would be useful in the social communication, to wider your audience, seed some knowledge etc etc and more important to change the traditional “ooh, poor children” approach.
I think Mayu gave us a nice input, may be not a video games, there are several kind of games, like quiz (learn fonts with http://fontgame.ilovetypography.com/) or social:
Waze, a social navigator, uses games to improve their maps
(I tried it and is very fun:)
Gogobot, a social traveller platform, uses games to get more review from users
Below a post about social gaming for Social
Yes, it’s just an input, may be will not be a video game to save africa, or maybe a day “millennium news” will be an iPhone app, but don’t exclude anything in this post brainstorming process.