1. A method of analyzing and using messages sent for a plurality of promoting entity accounts, comprising: obtaining a plurality of models for classifying a plurality of messages based on a plurality of message features for each message, each message sent via a computer network between a selected one of the promoting entity accounts and one or more subscribing users that subscribe to receive messages from such selected promoting entity account, wherein each model is trained to identify whether a message belongs to a particular class based on a lexicon that was generated for such particular class and a training set of messages that belong to the particular class and message that do not belong to the particular class; and classifying a new message based on the models and retaining classification information regarding the new message in a database that is accessible by a user so as to review the classification information on a computer display.