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3.
A person who added you on a social networking site i.e. Facebook, who you have had no prior or subsequent contact with. They are, in effect, just a face clogging up your friend list.
Can you believe some Facefriend added me just because we have the same name?
by Locus0mega August 08, 2010
 
1.
Someone you are "friends" with on a website, such as Facebook and don't aknowledge when you see them outside the internets . You talk to eachother, make up inside jokes, and even have deep and meaningful conversations for hours online. However, you mutually don't even grant eachother a simple "Hey" when passing in real live.
"So is Anna going to be at your party this Friday? I saw your wall-to-wall and you guys seem to be pretty close these days."

"Hahah, no way. We're just face-friends. I have no desire to see her in the flesh."
by hell's bells June 04, 2007
 
2.
A person you accept as a "friend" on facebook, not necessarily a friend in reality, who can view and peruse your Facebook page.
After discovering John had a facebook page, we quickly became FaceFriends so that we could easily keep in touch.
by semi aquatic hippopotamus March 03, 2010