I don't have a Facebook account, but is there really no way to not share your available status to your friends? In Gmail you can simply sign out of Hangouts. On a side note, > If you’re wondering why the response starts with “for (;;);”, it’s to, among other things, encourage developers to use a quality JSON decoder, instead of like, y’know, eval(). This is wrong, as I commented on the linked StackOverflow post, perh…
Any messages you get when your chat is off just go to your Facebook inbox so you can still get messages even with it off you just kinda lose that online live kinda element. I mean this works just like most chat applications work. They basically all say you're online or not too.