See drunk dial, but refers primarily to using facebook.com or other social networking sites (like myspace.com) to send your inebriated and often absurd messages. Generally only used if drunk dialing is not an option (i.e., the person you are drunk facebooking would not willingly give you their cell phone number).
Jane: So I went home with this guy after I met him at a party right? But then the next morning he wouldn't give me his number even though I was soooo in love with him. So like that night I got wasted with my friends and drunk facebooked him!
John: You're a crazy bitch.