@article{emoticonsvsemojisontwitteracausal,
  title = {Emoticons vs. Emojis on Twitter: A Causal Inference Approach},
  author = {Umashanthi Pavalanathan and Jacob Eisenstein},
  year = {2015},
  eprint = {1510.08480},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1510.08480v1},
}