1. A method for automatically expanding existing data content that is included in a corpus comprising: automatically generating search queries to search for content related to existing data, the queries being generated based on existing data content; automatically retrieving content from one or more data repositories; automatically extracting units of text from the retrieved content; automatically determining a relevance of the extracted units of text and their relatedness to the existing data; and automatically selecting new sources of content and including them in the corpus based on the determined relevance.