31. A system, comprising: a processor; a storage device storing computer-executable instructions which, when executed by the processor, cause the processor to: access a message log associated with users; based on the message log, compute: knowledge scores that indicate an extent to which the users are regarded as authorities on a topic, and power scores that indicate an extent to which some users receive messages of the message log from other users; receive a selection of an individual user; and responsive to receiving the selection, cause a graphical user interface (GUI) to be displayed, the GUI including a chart depicting the respective knowledge scores and the respective power scores for the individual user on the topic.
31. A system, comprising: a processor; a storage device storing computer-executable instructions which, when executed by the processor, cause the processor to: access a message log associated with users; based on the message log, compute: knowledge scores that indicate an extent to which the users are regarded as authorities on a topic, and power scores that indicate an extent to which some users receive messages of the message log from other users; receive a selection of an individual user; and responsive to receiving the selection, cause a graphical user interface (GUI) to be displayed, the GUI including a chart depicting the respective knowledge scores and the respective power scores for the individual user on the topic. 33. The system of claim 31 , further comprising an input device, wherein the computer-executable instructions further cause the processor to receive the selection via the input device.