Faceslacker
A person who adds you on Facebook just to post on your wall. They never talk to you in real life and sometimes ignore you completely.
They added me so they could post on my wall, but I've never seen them outside of school.
They posted on my wall, but when I asked why they never say hi, they said, 'I don't know you.'
They added me on Facebook, then blocked me when I asked why they never talk to me.