[Air-L] Collecting data from Facebook account of deceased people

Hello, I am looking for literature pertaining to the ethics of research involving data from Facebook account of deceased people (data left by the deceased and on going data posted on their wall). Any information will be welcome. Thanks a lot, Julie Sergent Conseillère en éthique de la recherche pour les projets étudiants (CERPÉ) Faculté des sciences humaines Université du Québec à Montréal