MINT -- Mainstream and Independent News Text Corpus
This addresses the need for nuanced misinformation analysis beyond binary classification for researchers and media analysts, though it is incremental in expanding corpus diversity.
The researchers tackled the problem of misinformation by creating MINT, a comprehensive corpus of Portuguese news articles across five categories, and found that conspiracy theories and opinion articles share high subjectivity and fallacious arguments, while hard news is more objective and sourced.
Most corpora approach misinformation as a binary problem, classifying texts as real or fake. However, they fail to consider the diversity of existing textual genres and types, which present different properties usually associated with credibility. To address this problem, we created MINT, a comprehensive corpus of news articles collected from mainstream and independent Portuguese media sources, over a full year period. MINT includes five categories of content: hard news, opinion articles, soft news, satirical news, and conspiracy theories. This paper presents a set of linguistic metrics for characterization of the articles in each category, based on the analysis of an annotation initiative performed by online readers. The results show that (i) conspiracy theories and opinion articles present similar levels of subjectivity, and make use of fallacious arguments; (ii) irony and sarcasm are not only prevalent in satirical news, but also in conspiracy and opinion news articles; and (iii) hard news differ from soft news by resorting to more sources of information, and presenting a higher degree of objectivity.