To continuously talk crap about someone, or post song that are directly pointed at someone. Most hatebooking actions are done in a very passive aggressive manor so as to be able to skit blame whenever possible.
Ie: Bob had sex with Becky a few times. Becks then said she didn't want to have sex whit Bob anymore. Bob then began posting things like "you are a cold hearted bitch and I feel sorry for anyone who gets close to you" on facebook. This is called hatebooking