Hashtags often carry very important information, such as emotion 1 Our toolkit along with the code and data are publicly available at https://github.com/mounicam/ hashtag_master  2017), sentiment (Mohammad et al., 2013), sarcasm (Bamman and Smith, 2015), and named entities (Finin et al., 2010;Ritter et al., 2011).
inferring the semantics of hashtags is nontrivial since many hashtags contain multiple tokens joined together, which frequently leads to multiple potential interpretations (e.g., lion head vs. lionhead).