“…Girardin et al (2009) evaluated urban attractiveness by analyzing images from Flickr and mobile phone usage data, while Sun, Fan, Bakillah and Zipf (2015) used geo-tagged images for road-based travel recommendations. As another approach, several researchers improved and refined various methodologies for extracting emotions (Resch et al, 2016), transit rider satisfaction (Collins, Hasan, & Ukkusuri, 2013), and community happiness (Quercia et al, 2012) from Twitter data, also combined with demographics and other objective characteristics of a place such as education or obesity (Mitchell, Frank, Harris, Dodds, & Danforth, 2013), or even defined sentiment as a function of movement . The advantages of utilizing available additional datasets such as demographics, mobile phone data or mobility trajectories are twofold; they can help the interpretation of the primary results extracted from social media, and, on the other hand, they are also appropriate for validation purposes.…”