I went through a phase of watching stuff like this a few months ago... After the first vid I saw I didn't eat or sleep properly for a day, and now I'm no longer seriously affected.
Not sure if facebook should allow vids like these but if you are interested (makes good drinking games)- go and watch the Banned in America series which are widely available online.
RE Africa- some parts of it are just ridiculous ****ed up. Look at this doc if you are interested on Liberia:
http://www.youtube.com/watch?v=ZRuSS0iiFyo
Cannibalism and rape is everyday occurrence there...
Also obv for those in the know proper gore is very easy to find and it's not on facebook.