“…Then, they use topological analysis to understand the relationships that one keyword has with another. As for the SMA methods, the following were identified: (i) time analysis, where a timeline of social media is made, identifying the number of publications during a period [6], [31], [38], [39]; (ii) textual analysis, where social media keywords were studied using natural language processing (NLP) [37], [38], [40], [39]; (iii) statistical analysis, where the studies used hypothesis tests, means and percentages [41], [42], [32], [43]; (iv) sentiment analysis, which aims to identify and extract subjective information from social media by combining NLP and machine learning techniques to assign weighted emotional scores [6], [31], [44], [43], [38], [39]; (v) geographic analysis, where media upload coordinates are used to map their geographic locations [38], [39]; and finally (vi) demographic analysis, where age and gender of the social media user are estimated using their first and last name as input [6]. Figure . 4 illustrates this analysis and shows a radar graph of the popularity of the SNA and SMA techniques.…”