Main question: Is there a character limit on Facebook private/direct messages?
Does this differ when submitting a message on a mobile device as opposed to a regular desktop browser - or on the message page as opposed to the chat window that appears in the corner of the screen?
What happens if a message is too long (i.e. is there any kind of a notification, or does it get split up)?
I've seen some conflicting but limited responses to this question online (though most on Stack Overflow seem to apply to APIs/applications, not regular usage), so just looking for some up-to-date clarification at the tail-end of 2014. I'm NOT asking this question in relation to comments or wall posts.