Emoji natural language processing

In Instagram Engineering Blog you can read about NLP techniques for discovering "context" of emoji
(like this one on the picture). They use word2vec for mapping every emoji to metric space and t-SNE as visualisation tool.
Full texts of articles:

Emojineering Part 1: Machine Learning for Emoji Trends

Emojineering Part 2: Implementing Hashtag Emoji
Emoji Wiki