Ok, so in turn I would blame the "User Confusion" on Facebook's decision to change everyone's public facing email address (without warning or consent) which the

Ok, so in turn I would blame the "User Confusion" on Facebook's decision to change everyone's public facing email address (without warning or consent) which then pushed the email into a system many of the users have never even touched. (and perhaps a poorly designed email system though I haven't used it so I can't say personally)