Identifying the current growing of social phenomenons that get to modify society, it was developed a reseach focused on cocreation as social innovation that takes relevance in urban culture development, based on the question: How cocreation is articulated inside a city-brand strategy in order to transform its positioning? In order to answer, it was established a theorical base, in the same way, reported cases about the topic were analyzed to finally choose Medellín to make an online documental tracking to its strategy as a city-brand from the social cocreation platform MiMiedellin.org. It is analyzed its contribution to create a defined positioning, and finally it is identified how cocreation trascends and achieves to become transverse axis of all the city strategy, contributing significantly to its construction as a Brand, and positively transforming its position locally and internationally