“…Forty studies applied the lexicon-based sentiment analysis method, using predefined lexicons annotated with sentiment polarities (eg, positive, negative, or neutral) to determine sentiments expressed in the parsed text . TextBlob and VADER (Valence Aware Dictionary and Sentiment Reasoner) were 2 well-known rule-based lexical sentiment analyzers [19,25,26,33,[37][38][39][40][41]43,44,46,49,51,53,[56][57][58]. Moreover, 11 studies further predicted the emotion types expressed in the tweets [20,21,23,26,32,37,45,50,53,54,58], and 8 classified emotions as "trust, surprise, sadness, joy, anticipation, disgust, fear, and anger" using the National Research Council Sentiment Lexicon [20,23,32,37,45,50,54,58].…”