Expo is the Universal Exhibition that the city of Milan hosted from May to October, 2015, under the theme: "Feeding the Planet, Energy for Life". Nevertheless, if the big event is important for awakening the world's interest and attracting investment, much attention is dedicated to the " Expo after Expo" phase, with the aim to keep alive the public discussion on the these crucial issues even by the end of the exposition period. In summary, what will be the legacies of Expo 2015? This work takes

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... an innovative approach to this question by analysing Twitter data focusing on the "after Expo" period. More specifically, the analysis of the distribution in the Twitter sphere of a set of food-related topics (right to food, sustainability, food losses as examples) is performed. Results can represent an opportunity to understand if the discussion of the global challenges linked to the theme of Expo Milano 2015 can also bring lasting benefits in terms of public awareness.