19. The non-transitory computer readable storage medium of claim 14 , further including instructions which, when executed by the computer system, cause the computer system to send to the client system for display content of a respective user-selected conversation when the user selects the respective conversation in the first list of conversations.
19. The non-transitory computer readable storage medium of claim 14 , further including instructions which, when executed by the computer system, cause the computer system to send to the client system for display content of a respective user-selected conversation when the user selects the respective conversation in the first list of conversations. 20. The non-transitory computer readable storage medium of claim 19 , including instructions which, when executed by the computer system, enable the user to associate the user-selected conversation with a category while the content of the user-selected conversation is being displayed, the category having a user-specified identifier.