To aggressively stalk; i.e., to Facebook someone so thoroughly that one has virtually explored all possible nooks and crannies of the stalkee's Facebook personality.
A misspelling of "Facebook" used to refer to a version of Facebook in the game "Emily is Away," available on Steam. This slang term is also associated with "Crazy Facenook Disease," an addiction to Facebook, known as "Penyakit Fesnuk Gila" in Bahasa Indonesia.
Ever since I started playing Emily is Away, I can't stoplaughing at how they turned Facebook into Facenook and even made up that Crazy Facenook Disease!
When a hurt, spiteful person posts something personal, private and intimate about another person where that person will in turn feel betrayed, embarrassed, hurt, or even criminally prosecuted.
She told John she wanted to be with him for the rest of her life, then she changed her mind. John didn't take too kindly with her decision. He told her, "Bitch, I'll Facebook your ass, so he Facebooked her ass and posted her brazenly bragging about all of her recent misdeeds
This is a person who works for the Fire Department and at every opportunity this person is posting on Facebook about everything they have ever done while on duty. This is because they are not very good at the job, so they need all of the "pats on the back" from their other fake "friends" on Facebook.