1. Collective smile: measuring societal happiness from geolocated images;Abdullah,2015
2. Social indicators of well-being;Andrew,1976
3. Emotion sensors go to school;Arroyo,2009
4. Faces engage us: Photos with faces attract more likes and comments on Instagram;Bakhshi,2014
5. Emotion-corpus guided lexicons for sentiment analysis on Twitter;Bandhakavi,2016