7. The system of claim 2 , wherein said inference data acquisition module configured to acquire inference data including a first inference data that indicates an inferred mental state of a first authoring user in connection with a particular item of an electronic message and a second inference data that indicates an inferred mental state of a second authoring user in connection with the particular item of the electronic message comprises: an inference data determination module configured to determine the first inference data based, at least in part, on one or more observed physical characteristics of the first authoring user and to determine the second inference data based, at least in part, on one or more observed physical characteristics of the second authoring user.
7. The system of claim 2 , wherein said inference data acquisition module configured to acquire inference data including a first inference data that indicates an inferred mental state of a first authoring user in connection with a particular item of an electronic message and a second inference data that indicates an inferred mental state of a second authoring user in connection with the particular item of the electronic message comprises: an inference data determination module configured to determine the first inference data based, at least in part, on one or more observed physical characteristics of the first authoring user and to determine the second inference data based, at least in part, on one or more observed physical characteristics of the second authoring user. 8. The system of claim 7 , wherein said inference data determination module configured to determine the first inference data based, at least in part, on one or more observed physical characteristics of the first authoring user and to determine the second inference data based, at least in part, on one or more observed physical characteristics of the second authoring user further comprises: a physical characteristic observation module configured to observe the one or more physical characteristics of the first authoring user during or proximate to a first action executed in connection with the particular item and performed, at least in part, by the first authoring user, and to observe the one or more physical characteristics of the second authoring user during or proximate to a second action executed in connection with the particular item and performed, at least in part, by the second authoring user.