29. The computer-readable medium of claim 26 , wherein the program further executes the steps of: storing a plurality of speech models, wherein each speech model is associated with a potential speaker; processing the accessed audio data; and comparing the processed audio data to a subset of the plurality of speech models, the subset being determined based at least partly on the identified social graph.
26. A computer-readable medium containing a program which executes the steps of: capture, via a microphone on a mobile device, audio data comprising a speech signal; inferring a context of a user of the mobile device; identifying a social graph based at least partly on the inferred context, the social graph comprising a list of potential speakers; and identifying a speaker determined to have vocally contributed to the speech signal, the speaker identification based at least partly on the identified social graph.