Creating emoji lexica from unsupervised sentiment analysis of their descriptions.

•Method to create emoji sentiment lexicon using unsupervised SA and Emojipedia.•Unsupervised SA strategy based on semantic dependencies with propagation.•Lexicon variants created considering sentiment distribution of messages with emojis.•Lexica compare favorably well with other ones obtained manually or with CLDR names.•Approach and variants applied to the Spanish, English and Spanish+English datasets.