9. The method of claim 8 , wherein tokenizing the one or more items of text into one or more keywords or phrases comprises: identifying a frequency with which one or more keywords or phrases appear in a corpus of content items; and tokenizing the one or more items of extracted text into the one or more keywords or phrases that appear with the greatest frequency in the corpus of content items.
9. The method of claim 8 , wherein tokenizing the one or more items of text into one or more keywords or phrases comprises: identifying a frequency with which one or more keywords or phrases appear in a corpus of content items; and tokenizing the one or more items of extracted text into the one or more keywords or phrases that appear with the greatest frequency in the corpus of content items. 12. The method of claim 9 , wherein identifying the frequency with which one or more keywords or phrases appear in the corpus of content items comprises identifying a frequency with which one or more keywords or phrases appear in one or more query logs.