When someone blocks you from viewing their facebook profile. Either by blocking you entirely or just parts of their profile; pictures, mutual friends, comments.
Bill, "Hey, how come I can't see April's mutual friends but I can see her comments?"
Dave, "Oh you don't know? You got Faceblocked"
When someone adds a comment to your Facebook page: 1. noone likes them and would not want to comment after their comment
2. deters others from commenting on your status/photo
Oh great...Sue just faceblocked my status.
A mental condition wherein the victim/sufferer receives a Facebook friend invitation, can clearly see the he/she and the sender share many mutual friends, but can't for the life of Pete, remember who the hell this person is.
I see you are friends with ______ . I just received a friend invite from her and am experiencing a severe case of Faceblock. How do I know this person?