1. A computer implemented method for managing credibility of a set of computer-generated search results for a user-input search query in an automated question answering system, the method comprising: determining, by a natural language processing technique configured to analyze at least a portion of the set of search results and at least a portion of the user-input search query, at least one credibility factor configured to indicate similarity to a subject matter of the user-input search query, wherein the at least one credibility factor is selected from a group consisting of an origin location feature, a chronology feature, or a milestone feature, and wherein determining the at least one credibility factor includes parsing the portion of the set of computer-generated search results and the user-input search query to determine a semantic feature, wherein the semantic feature is at least in part associated with word meaning, and wherein parsing the portion of the set of computer-generated search results and the user-input search query to determine a syntactic feature, wherein the syntactic feature is at least in part associated with part-of-speech; establishing a relevance relationship between the at least one credibility factor and source information of a first search result of the set of computer-generated search results, wherein the source information is based on the at least one credibility factor, and wherein establishing the relevance relationship includes comparing metadata coupled with the source information to metadata coupled with the subject matter of the user-input search query computing, by a statistical credibility model, a credibility score for the first search result of the set of search results based on the relevance relationship between the at least one credibility factor and the source information of the set of search results, wherein the statistical credibility model includes probabilistic information for the source information; selecting a subset of the set of computer-generated search results; and providing the selected subset of the set of computer-generated search results in a display area.