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The aim of this paper is to present reflections from Discourse Analysis and from Construction Grammar on the creation of a dictionary for sentiment analysis of Facebook comments. The reflections from Discourse Analysis address problems such as the identification of the semantic orientation of words that present opposite polarities depending on the ideological formation of the speaker. Another reflection from Discourse Analysis regards the fact that the writers of the comments use nouns and noun phrases not only to name some entity, but also to build discourse objects in a way that the label they give to the discourse objects reveals an evaluation. In order to analyze constructions larger than words, such as idioms, we draw on Construction Grammar principles. The investigation of constructions and idioms can provide a better understanding of sentiment in text. The corpus consists of comments extracted manually from Facebook public discussion pages related to diverse themes, such as politics, education, religion, music, lifestyle etc.

“Haters gonna hate”: challenges for sentiment analysis of Facebook comments in Brazilian Portuguese