29. The computationally-implemented system of claim 25 , wherein said means for including into the electronic message the source identity data providing one or more identities of the one or more sources comprises: means for including into the electronic message source identity data providing one or more identities of one or more sensors used to sense one or more physical characteristics of the authoring user, the inference data indicative of the inferred mental state of the authoring user being based, at least in part, on the one or more physical characteristics of the authoring user sensed by the one or more sensors.
29. The computationally-implemented system of claim 25 , wherein said means for including into the electronic message the source identity data providing one or more identities of the one or more sources comprises: means for including into the electronic message source identity data providing one or more identities of one or more sensors used to sense one or more physical characteristics of the authoring user, the inference data indicative of the inferred mental state of the authoring user being based, at least in part, on the one or more physical characteristics of the authoring user sensed by the one or more sensors. 30. The computationally-implemented system of claim 29 , wherein said means for including into the electronic message source identity data providing one or more identities of one or more sensors used to sense one or more physical characteristics of the authoring user, the inference data indicative of the inferred mental state of the authoring user being based, at least in part, on the one or more physical characteristics of the authoring user sensed by the one or more sensors comprises: means for including into the electronic message an identity for at least a functional magnetic resonance image (fMRI) device that was used to sense the one or more physical characteristics of the authoring user.