I was betting on a fb test account for spam-bots, but I googled she also has a yt account http://www.youtube.com/user/refbatch which is even more creepy than her fb.
first for me it was obvious that's a bot, now I see the very short intervals in the conversation do not make the content impossible to be human generated, still OP's question is valid: what the hell is it???
unless it's some kind of viral.. a very creepy viral...
oh, and I like the 'spies communicating' theory
Originally I ruled out a single person being behind it just due to the volume / frequency of the FB post. But that refbatch youtube account is hitting 1 video / ten minutes, and that pretty much has to be a real person, so maybe I'm mistaken.