15. A computer program product comprising: at least one processor; and a computer readable storage medium having computer readable program code embodied therewith and executable by the at least one processor, the computer readable program code comprising: computer readable program code configured to receive a query; computer readable program code configured to automatically classify the query as subjective or objective; computer readable program code configured, to thereupon calculate, for discussion threads of the query, at least one of: a subjectivity score and an objectivity score; wherein to calculate comprises: applying a maximum entropy model; and incorporating, with respect to at least one discussion thread, at least one member taken from the group consisting of: a number of posts in a discussion thread; average number of words in posts, presence of a predetermined pattern among posts, a number of authors of posts within a discussion thread, average depth of each post, maximum depth of a post, and length of at least one reply; and computer readable program code configured to determine a degree of relevance to the query of at least one of: the discussion threads, and at least one post in the at least one discussion thread; wherein to determine the degree of relevance of the query to the discussion threads comprises: iteratively determining a relevance score with respect to each post in a discussion thread and then accepting a maximum relevance score with respect to a post in a discussion thread; determining a penalty or reward regulizer with respect to choosing a predetermined number of posts for calculating a relevance score of a thread; and including at least one of: a subjectivity score of the thread and an objectivity score of the thread; and computer readable program code configured to rank the discussion threads based on the calculating and determining of a degree of relevance of the query to the discussion threads.
15. A computer program product comprising: at least one processor; and a computer readable storage medium having computer readable program code embodied therewith and executable by the at least one processor, the computer readable program code comprising: computer readable program code configured to receive a query; computer readable program code configured to automatically classify the query as subjective or objective; computer readable program code configured, to thereupon calculate, for discussion threads of the query, at least one of: a subjectivity score and an objectivity score; wherein to calculate comprises: applying a maximum entropy model; and incorporating, with respect to at least one discussion thread, at least one member taken from the group consisting of: a number of posts in a discussion thread; average number of words in posts, presence of a predetermined pattern among posts, a number of authors of posts within a discussion thread, average depth of each post, maximum depth of a post, and length of at least one reply; and computer readable program code configured to determine a degree of relevance to the query of at least one of: the discussion threads, and at least one post in the at least one discussion thread; wherein to determine the degree of relevance of the query to the discussion threads comprises: iteratively determining a relevance score with respect to each post in a discussion thread and then accepting a maximum relevance score with respect to a post in a discussion thread; determining a penalty or reward regulizer with respect to choosing a predetermined number of posts for calculating a relevance score of a thread; and including at least one of: a subjectivity score of the thread and an objectivity score of the thread; and computer readable program code configured to rank the discussion threads based on the calculating and determining of a degree of relevance of the query to the discussion threads. 16. The computer program product according to claim 15 , wherein said computer readable program code is configured to determine a degree of relevance to the query of both of: the discussion threads, and at least one post in the discussion threads.