The act of posting random, sometimes rambling nonsense or eruptions of garbled logic as a result of imbibing alcohol or other intoxicants.
"Sorry for my long post last night -- I had what I thought were some good story ideas, so I posted them on FB. Today, though, it appears I had too much wine and was just shit-Facebooking."
or
"Ignore Jacob's lame jokes on his page. I happen to know he had some buddies over last night and they were shit-Facebooking."
The act of using Facebook while intoxicated. May or may not include confessions of undying love to friends, ex's, or total strangers. Grammar and logic will likely be poor. Similar to a drunk dial.
Chris - "Dude, you left 11 incoherent wall posts on my profile last night. What the fuck?"
Spencer - "What? No, I didn't! Oh, wait...yeah, I was shitfacedbooking."
When you are very Intoxicated and start posting things on a social network that you would NEVER post if you were sober.
Frank: "What the hell dude"
Jim: "What?'
Frank: "You said you wanted to fuck my wife on facebook last night"
Jim: "Oh fuck, I think I was shitfacebooking last night."
Frank: "You're Fired" (Punches Jim in the face)