22. A mobile device for identifying a speaker, the-mobile device comprising: a microphone; and one or more processors coupled to the microphone and configured to: capture, via the microphone, audio data comprising a speech signal; infer a context of a user of the mobile device; identify a social graph based at least partly on the inferred context, the social graph comprising a list of potential speakers; and identify a speaker determined to have vocally contributed to the speech signal, the speaker identification based at least partly on the identified social graph.
25. The mobile device of claim 22 , wherein the mobile device comprises a display, and wherein the one or more processors are further configured to present the identification of the speaker on the display.