27. The method of claim 26 , wherein performing the first level of indexing further comprises identifying one or more keywords for each piece of content in the corpus of content and identifying one of one or more synsets and one or more entities for each piece of content in the corpus of content to generate the one or more features for each piece of content in the corpus of content.
26. A computer implemented indexing method for linking formally represented knowledge with a corpus of content comprising a plurality of pieces of content using a knowledge base containing a plurality of pieces of formally represented knowledge, the formally represented knowledge further comprising one or more synsets wherein each synset contains a group of terms that have the same meaning, one or more taxonomies wherein each taxonomy contains one or more synsets in a subject matter area that are organized from a synset having a general meaning to a synset having a specific meaning, one or more ontologies wherein each ontology contains one or more synsets associated with an area of interest and one or more facets wherein each facet is associated with a particular ontology and wherein a document is associated with the facet when the document contains the one or more synsets associated with the facet, the method comprising: performing, using a computer implemented indexing engine, a first level of indexing to generate one or more features for each piece of content in the corpus of content; and performing, using the indexing engine, a second level of indexing, using the one or more features for each piece of content, to classify a piece of content to a particular facet based on the one or more facets in the knowledge base and to determine an authority score associated with each piece of content, the authority score being based on one or more factors including a reputation of the author of the piece of content and a reliability of the source of the piece of content.