Enhanced Sentiment Learning Using Twitter Hashtags and Smileys Dmitry Davidov author Oren Tsur author Ari Rappoport author 2010-08 text Coling 2010: Posters Chu-Ren Huang editor Dan Jurafsky editor Coling 2010 Organizing Committee Beijing, China conference publication davidov-etal-2010-enhanced https://aclanthology.org/C10-2028/ 2010-08 241 249