Tight competition among companies has been making many companies to increase their efforts to collect information from various media for the sake of their service analysis. Recorded data in social media such as Twitter can be used as a potential data to be analyzed, since Twitter is becoming one of the most popular social media in the world. Text classification is developed to observe positive and negative opinions of the customers on the services given by company in the form of heat map. Prior to developing the text classifier, data preprocessing was performed in order to determine...