If they say 'Inbox me!' or something like that they mean they want you to add them as a friend on facebook.
What you said
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.
happy shout
What is a shout?
myspace, facebook, team jonas, fanfamily, or their fanmail.
Explain, utter, or babble. Those word mean shout out.
to yell or shout
I shout.
To shout or yell
uio.
shout enough
I think it's just a random shout that doesn't mean anything, sounds epic though.
To speak loudly or to yell.
a silent shout or cry