Also research in emotion analysis of text suggest that 1 https://dev.twitter.com/docs/using-search Table 2: Average distribution of emotions across  the folds  Emotion  Training  Test  Anger  58410  6496  Fear  13692  1548  Joy  74108  8235  Sadness  63711  7069  Surprise  2533  282  Love  31127  3464  Total  243855  27095 lexicon based features were effective compared to that of n-gram features in an emotion classification of text (Aman and Szpakowicz, 2008;Mohammad, 2012a).
we decided to use the lexicon to derive features for text representation.