These are some useful articles related to the use of emoticons.
Reader’s Digest article:
Why Do We Use Emojis Anyway? A Fascinating History of Emoticons
Shigetaka Kurita discussing the emoji:
http://www.theverge.com/2013/3/4/3966140/how-emoji-conquered-the-world
Timeline of Emoji development:
http://www.businessinsider.com/emoji-timeline-history-2013-12?IR=T
Blissfully Happy or Ready to Fight?:
NPR article – http://www.npr.org/sections/thetwo-way/2016/04/12/473965971/lost-in-translation-study-finds-interpretation-of-emojis-can-vary-widely
The original paper – https://grouplens.org/site-content/uploads/Emoji_Interpretation_Paper.pdf
