I've finally given up using Facebook messaging, I find it slow and clunky - however it is extremely useful in that if I am offline and someone sends me a message it pops up when I log back in.
I converted to an IRC channel and want to use it as a help channel for a group of 3d Printers but if you log out there is now ay of seeing what messages have been sent while you are offline. It will be a pain to idle most the time.
Is there anything out there that meets this gap?