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twitter online reputation management social media replab topic detection opinion mining company name disambiguation clustering evaluation entity profiling monitoring real-time lrec manual annotation dataset 肠濒补蝉蝉颈铿乧补迟颈辞苍 2012 trending topics filtering classification ugc womsa2009 sepln2009 information theory theory fusion ranking information retrieval audio podcast speakerlda topic models slam2015 acmmm2015 orma active learning polarity sentiment microblog posts aspects sigir2012 summarization events opinion-based entity profiling