Graffiti, the way of communicate

hi, recently i`ve noticed many graffities at the city, i`ve seen many articles about the topic, but not only in Colombia, also in many other countries arround the world.
i can say that grafiti art is consider by two types of people, first type, people whom are against graffiti, the other part are the ones whom are in a good mood about it. but it is true that all people even if they are against or support these. they have one oppinion in common: these is a way to transmit a message, the message that they are transmitting change because of the conditions of the country or city in wich is created the graffiti. well, this is for latin american countries. but what happen in african counties?: it happen the same; graffiti is their way to transmit a message about anything, either political things, or personal things. it is interesting how people think tha same way but they are in different places; even when people use grafffiti to different things, like protesting or for a jocke, they all have the same purpose, that is to communicate anthing, it doesn't matter about the topic of the graffiti to know the real purpose of it, that is communicating.