Similar to "crop dusting," face-dusting is the act of making a vicious, inappropriate comment on a friend's facebook page and then ignoring the outraged aftermath. Face-dusting.
Also has application on Twitter, though Mr. Gottfried did prove that you can ignore the aftermath all you want, you could still lose your pool cleaning income from "dusting."
"Happy Bday. May it be your last. Seriously. You're a blight on humanity, and need to be expunged. And then rot. Or rot first. Whatever." -Post, then ignore the ridiculous comments from cranky, oversensitive family members and friends. Face-dusting.