What you said
Chat with our AI personalities
If they say 'Inbox me!' or something like that they mean they want you to add them as a friend on facebook.
fbf
It means you can chat to people on Facebook who are your friends and are online when you are.
blackberry messanger
I don't know what you mean but I think you mean when you get an e-mail from facebook. Anyway I think it just says your friend has a birthday today or someone poked you and then it has the facebook logo so there are many things facebook emails you about. Hope this helped.