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In recent years social media have emerged as popular platforms for people to share their thoughts and opinions on all kind of topics. Tracking opinion over time is a powerful tool that can be used for sentiment prediction or to detect the possible reasons of a sentiment change. Understanding topic and sentiment evolution allows enterprises or government to capture negative sentiment and act promptly. In this study, we explore conventional time series analysis methods and their applicability ondoi:10.1145/2911451.2914702 dblp:conf/sigir/GiachanouC16 fatcat:xbiukvhpuvbo3grqahrhbkzzci