13. The non-transitory machine-readable medium recited in claim 12 , wherein the machine-readable instructions that train the classifier comprise machine-readable instructions that, when executed by the processor: select a text window comprising an entity of the microblogging data; select one or more features from the text window to train the classifier to determine a sentiment polarity for the entity.
13. The non-transitory machine-readable medium recited in claim 12 , wherein the machine-readable instructions that train the classifier comprise machine-readable instructions that, when executed by the processor: select a text window comprising an entity of the microblogging data; select one or more features from the text window to train the classifier to determine a sentiment polarity for the entity. 14. The non-transitory machine-readable medium recited in claim 13 , wherein the new opinion term has a Pearsons chi-square value greater than a specified threshold.