When someone leaves their Facebook account logged in or shares their login details with someone else at which point someone makes posts to said person's account without their knowledge.
"Bill just got facejacked. That guy gave me his login credentials for Facebook so I wrote on his wall and updated his status."
by Agent SILVERFOX February 13, 2009
When you log on to Face Book and see that people have been carrying on conversations on "your page" without you. People that don't even know each other just sharing the witty reparte and now it takes up your whole page!
"I went to my home page on Face Book only to find my page had been "face-jacked" by my friends about some comment I made, that now has nothing to do with my original thought!"
by bearbax June 15, 2009