13. The method of claim 12 , further comprising: determining the plurality of total sentiment scores for the plurality of blocks of characters using the sentiment dictionary by: accessing the sentiment dictionary; identifying one or more expressions in a respective block of characters that are in the sentiment dictionary; mapping the one or more expressions in the respective block to one or more corresponding sentiment values using the sentiment dictionary; and determining a respective total sentiment score for the respective block of characters by aggregating the one or more corresponding sentiment values.
14. The method of claim 13 , further comprising: determining the respective total sentiment score for the respective block of characters by: determining a standard deviation associated with each sentiment value of the one or more corresponding sentiment values; determining weighted sentiment values by multiplying each sentiment value of the one or more corresponding sentiment values by a respective weighting factor based on an associated standard deviation value; and determining the respective total sentiment score for the respective block of characters by aggregating the weighted sentiment values.