“…The volume of data generated in social media has grown from terabytes to petabytes (Gandomi & Haider, 2015;He & Chen, 2014), and data stored and analysed by big companies are set to move from the petabyte to exabyte magnitude soon (Hu, Wen, Chua, & Li, 2014). Social media can be classified into blogs, review sites, media sharing, question-and-answer sites, social bookmarking, social networking, social news, and wikis (Gandomi & Haider, 2015;Marine-Roig, 2014). Lu and Stepchenkova (2015) found that the main sources for studies on UGC data are, in order of frequency: consumer review websites, blogs, media-sharing websites, social networks, and virtual communities; the main topic areas being service quality, destination image and reputation, UGC as electronic word-of-mouth (eWOM), experiences and behaviour, and mobility patterns.…”