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.