A "friend" on facebook whom you added after meeting for a brief period of time. A friend of a friend of a friend, someone you met at a bar, or just a random acquaintance who happened to add you. You rarely, if ever speak to this person.
"Why are 90% of my friends Facebook friends? Who the hell is (XXX)?"
"Who is (XXX)? Oh yeah, I talked to her once at the bar... great, another Facebook "friend""
A: "Who's this (XXX) person? I think talked to her once in my Biology 302 class."
B: "Bam, Facebook "friend!""