“…Examples of such applications are recognizing inflammatory messages (Spertus, 1997), tracking sentiment timelines in on-line discussions (Tong, 2001), extracting investor sentiment from stock message boards (Das and Chen, 2001), distinguishing editorials from news articles (e.g., (Wiebe, Wilson, and Bell, 2001;Yu and Hatzivassiloglou, 2003)), review classification (e.g., (Turney, 2002;Pang, Lee, and Vaithyanathan, 2002;Morinaga et al, 2002;Dave, Lawrence, and Pennock, 2003;Nasukawa and Yi, 2003;Beineke, Hastie, and Vaithyanathan, 2004;Mullen and Collier, 2004;Kudo and Matsumoto, 2004;Pang and Lee, 2005;Whitelaw, Garg, and Argamon, 2005)), mining opinions from product reviews (e.g., (Morinaga et al, 2002;Nasukawa and Yi, 2003;Yi et al, 2003;Hu and Liu, 2004;Popescu and Etzioni, 2005)), automatic expressive text-tospeech synthesis (Alm, Roth, and Sproat, 2005), information extraction (e.g., (Riloff, Wiebe, and Phillips, 2005)), and question answering (e.g., (Yu and Hatzivassiloglou, 2003;Stoyanov, Cardie, and Wiebe, 2005)). …”