“…The linguistic formality weights different types of words, with nouns, adjectives, articles and prepositions as positive elements, and adverbs, verbs and interjections as negative. The in-house classifier is based on linguistic features designed on top of the SpaCy NLP toolkit, 11 such as text readability, n-gram counts, constituency, part-of-speech, lexical features, casing and punctuation, entity, subjectivity (TextBlob NLP) 12 and Word2Vec 13 features. We also include low-level features, such as the frequency of punctuation, numbers, "5W1H" words, superlative adjectives and adverbs.…”