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1.
Any embarrassing, demoralizing or downright hideous picture of somebody saved on another friends camera that could be used against them for blackmail.
"Hey you better not take the last sprite or I'll put that picture of you after you spilled eggnog on your crotch at the Christmas party on facebook!"

"Damn, thats some pretty good facebook ammo"
by shovin' buddies December 26, 2009