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1.
The half-smiling expression people wear when gazing at pictures on their computer screens. Often accompanied by a slightly tilted head. Also known as "MySpace Face."
Hey, check out that girl over there at the laptop. What's she smiling about?

That's facebook face. She's checking out pictures from last night's party.

by Shadwell February 13, 2009
 
2.
A face you put on while you're on a social networking site to make yourself seem either:
a) Nicer
b) "Cool"er
c) Something You're Not
d) All of the above
Jim always posts on statuses with his facebook face on, he thinks the girls are more attracted to being a badass, something he isn't in real life.
by An.on.ym.ou.s. June 07, 2010
 
3.
The overly excited/happy expression used for all social photographs in which subjects wish to appear as though they are living a much more exciting and glamourous life than they really are (in bars, clubs, etc); comes from the knowledge that the photos will be on facebook the next day.
We sat at the bar and laughed as the 3 girls across from us squeezed together and put on their facebook faces for their drunk friend's camera phone.
by granola-grrrl December 08, 2010
 
4.
noun. The name given to one who is a facebook addict.
"Oi, stop networking on facebook you gay facebookface."
by chris nissen October 19, 2008