1. A method for identifying a speaker with a mobile device, the method comprising: capturing, via a microphone on the mobile device, audio data comprising a speech signal; inferring, via the mobile device, a context of a user of the mobile device; identifying, via the mobile device, a social graph based at least partly on the inferred context, the social graph comprising a list of potential speakers; and identifying, via the mobile device, a speaker determined to have vocally contributed to the speech signal, the speaker identification based at least partly on the identified social graph.
13. The method of claim 1 , further comprising storing a plurality of social graphs, each of the plurality of social graphs being associated with a different context.