19. The system of claim 18 , the processors being further operable to: analyze the plurality of messages to classify content therein and form a set of individual content topics; and process the plurality of messages to identify a subset of messages related to a first topic; wherein the determination of the correlation values based on at least a portion of the logged information is limited to logged information associated with messages in the subset of messages.
18. A system comprising: one or more processors; and a memory coupled to the processors comprising instructions executable by the processors, the processors operable when executing the instructions to: evaluate a plurality of messages, each message associated with an author; log, for each message, information associated with the author, information associated with one or more designated recipients of the message, and time information associated with the message; determine correlation values for one or more sets of the designated recipients based on at least a portion of the logged information; and determine an association amongst a plurality of users over time, the determining being based on the correlation values, at least one of the plurality of users comprising at least one of the designated recipients.