38. The non-transitory computer-readable storage medium of claim 31 , further comprising: fetching the target document using the extracted link; associating the data extracted from the content preview source and the fetched target document; and adding the target document to the index that is searchable by the search engine.
38. The non-transitory computer-readable storage medium of claim 31 , further comprising: fetching the target document using the extracted link; associating the data extracted from the content preview source and the fetched target document; and adding the target document to the index that is searchable by the search engine. 41. The non-transitory computer-readable storage medium of claim 38 , further comprising: using at least a portion of the extracted data to present the target document as part of search results generated by the search engine in response to a search query.