Faceslacker
A person who becomes your friend, but only so they can post on your wall. They never talk to you, and if they do, it's just to say 'hey' and walk away.
They added me so they could post on my wall, but I've never seen them outside of school.
They said 'hey' in the hallway and walked away like I was invisible.
They posted on my wall, but when I asked why they never talk to me, they said, 'I don't know you.'