As a social protest the graffiti is all over the world. In Colombia, Brazil, Honduras, Argentina and more. Graffiti is a way to express our feelings, and in most of the south americans countries (even in central america) we are feeling unconformity with our goverments and politicians. In Colombia graffiti reflects the violence and problems with guerrillas, in Argentina is the satire against the political issues, Brazil is about the poverty problem, in Honduras the violence and the abuse of force by the police, but the general idea is the social protest. The graffiti is a scream for help, help for the people... And the worst is that in most of this nations, graffiti is vandalism.
Colombia: http://www.theguardian.com/books/gallery/2012/sep/graffiti-bogota-colombia-pictures
Argentina: http://www.aljazeera.com/video/americas/2013/08/20138514298675371.html
Honduras: http://www.aljazeera.com/indepth/features/2013/06/20136131358438705.html
Brazil: http://www.nytimes.com/interactive/2013/08/11/magazine/Look_Brazil.html?_r=2&
Juan Rodriguez