Used in reference to a romantic relationship, meaning that two parties are not really dating until their Facebook relationship statuses have changed.
"Are Emily and Mick really dating?"
"Yeah, it's Facebook-official and everything."
A term used to describe a serious or legit event that is verified on facebook. A person can be sure that something is definite by logging on and seeing evidence of it on facebook.
Vicky: "are caroline and jack dating now?"
George: " yup! Jack just asked her out after a week of being "together"."
Vicky: "Is it Facebook-official?"
Vicky:" wow. i didn't know things were that serious between them."