53. The system of claim 49 , wherein determining if the first metadata item is relevant to the content object comprises: generating a relevance score based upon a similarity of the first metadata item to the content object, wherein the first metadata item is relevant to the content object in response to the relevance score being at least a threshold value.
49. The system of claim 39 , further comprising: adding a reference to the content object in response to the content object being relevant to the first metadata item; and providing the content to the user.