9. A system comprising: a processor; and a computer-readable storage device storing instructions which, when executed by the processor, cause the processor to perform operations comprising: analyzing an audio stream of an utterance of a user to identify topics in the audio stream; identifying tags related to the topics to yield identified tags; identifying content of a document associated with the user; and based on the tags, the topics, and the content of the document, generating a tag recommendation for tagging the audio stream.
9. A system comprising: a processor; and a computer-readable storage device storing instructions which, when executed by the processor, cause the processor to perform operations comprising: analyzing an audio stream of an utterance of a user to identify topics in the audio stream; identifying tags related to the topics to yield identified tags; identifying content of a document associated with the user; and based on the tags, the topics, and the content of the document, generating a tag recommendation for tagging the audio stream. 11. The system of claim 9 , wherein the tag recommendation is further based on one of a tagging history of a user and a context of the user.