Actually, that's not true for the "Broadcast" one. I have Gwibber set up and running, but it still shows "Set up broadcast account". To clarify, clicking on the entry for the chat and mail opened the respective applications and changed the entries to just "Chat" and "Mail", clicking on "Set up broadcast accounts" opened up Gwibber but left "Set up broadcast accounts" in the applet.
Actually, that's not true for the "Broadcast" one. I have Gwibber set up and running, but it still shows "Set up broadcast account". To clarify, clicking on the entry for the chat and mail opened the respective applications and changed the entries to just "Chat" and "Mail", clicking on "Set up broadcast accounts" opened up Gwibber but left "Set up broadcast accounts" in the applet.