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1.
To masturbate over photos of someone on facebook.
This fit bird added me on facebook earlier, I might have a facewank over her later.
by as1985 April 23, 2009
 
2.
When in the act of face book raping somebody you realise you are logged in to your own account and have actually insulted yourself on your own wall.
OMG I just tried to Frape john but inatead told the world I like to lick dogs scrotum I just face wank ed
by Hinge 81 January 15, 2011
 
3.
The act of searching through facebook, finding an attractive picture of someone, and masturbating over it.
"Oh have you seen _____'s picture on facebook? Yeah bro, I had a mad facewank over it"
"omg I caught my room mate on the computer last night, having a facewank.
by WagyuMachine June 28, 2010