If that's so, why is Africa still a mess? We have no shortage of knowledge about the scale of corruption south of the Sahara (and north of it); the problem is that those who are prepared to fight in, let's say, Nigeria and those who want to stop corruption in Nigeria are seldom the same people.
In the end, weapons are the most important weapons. If a group of people no longer care about anything but their own power, and they're armed, the thing to do is to deprive them of those arms -- not to catalog their abuses and trust in the power of words.
Africa is a perfect example of a continent where, in many countries, there is no free press and little access to the Internet. In general you'll find a strong correlation between a lack of free press and low GDP, war, oppression etc. Yeah, causation != correlation, but obviously the reason for a corrupt government to disallow the free press is to keep itself in power.
In the end, weapons are the most important weapons. If a group of people no longer care about anything but their own power, and they're armed, the thing to do is to deprive them of those arms -- not to catalog their abuses and trust in the power of words.