For example, #angryattheworld and #angryatlife both have the prefix "an-gry at", which suggests the emotion ANGER.
researchers have also started to utilize the hashtags of tweets, but primarily to collect labeled data (e.g., for sarcasm (Davi-   and for sentiment/emotion data (Wang et al., 2012;Mohammad et al., 2013;Choudhury et al., 2012;Purver and Battersby, 2012;Mohammad, 2012a)).