8. The system of claim 1 , wherein said inference data acquisition module configured to acquire inference data including at least a first inference data that indicates an inferred mental state of a first authoring user in connection with a particular item of an electronic document 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 document comprises: a mental state inference module configured to infer a mental state of the first authoring user based, at least in part, on a result of an observation made of one or more physical characteristics of the first authoring user, and to infer a mental state of the second authoring user based, at least in part, on a result of an observation made of one or more physical characteristics of the second authoring user.
8. The system of claim 1 , wherein said inference data acquisition module configured to acquire inference data including at least a first inference data that indicates an inferred mental state of a first authoring user in connection with a particular item of an electronic document 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 document comprises: a mental state inference module configured to infer a mental state of the first authoring user based, at least in part, on a result of an observation made of one or more physical characteristics of the first authoring user, and to infer a mental state of the second authoring user based, at least in part, on a result of an observation made of one or more physical characteristics of the second authoring user. 9. The system of claim 8 , wherein said mental state inference module configured to infer a mental state of the first authoring user based, at least in part, on a result of an observation made of one or more physical characteristics of the first authoring user, and to infer a mental state of the second authoring user based, at least in part, on a result of an observation made of one or more physical characteristics of the second authoring user comprises: a mental state inference module configured to infer mental states of the first authoring user and the second authoring user that indicates that at least on one of the first authoring user or the second authoring user was in a state of anger, a state of distress, or a state of pain during or proximate to an action executed in connection with the particular item and performed, at least in part, by the at least one of the first authoring user or the second authoring user.