[Air-L] boilerplate email message research

Hi Can anyone advise of research or references on the social use of 'boilerplate' or prefabricated email messages - the messages containing jokes, sayings, cute messages etc. (not spam) that get forwarded on from person to person. The only direct reference I can find is the Boneva and Kraut article, Using e-mail for personal relationships: The difference gender makes, in The American Behavioral Scientist, November 2001. Many thanks Julie Dare