1. A method for classifying comments, comprising: receiving a collection of comments, each of the comments in the collection comprising text in a natural language and being associated with a previously-submitted idea submission which includes a description of an idea; natural language processing each of the comments to identify dependencies in at least a part of the comment; based on the identified dependencies, automatically classifying the comments according to a plurality of comment classes; and outputting information based on the assigned comment classes, wherein at least one of the natural language processing, classifying, and outputting is performed with a computer processor.