The verbose, non-colloquial and monologue nature of much of Web text is not a good match for the characteristics of human-human dialogue.
there are some other sources on the Web that have more potential for this purpose, such as human-written comments on news websites (e.g., NYTimes.com (Marge et al., 2010)) and online forums (e.g., RottenTomatoes.com (Huang et al., 2007), 2ch.net (Inoue et al., 2011)).