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wikipedia inspired graffiti, referencing a "citation needed" sticker found on New York subway advertising.
first sighted from user Alex at SNARFD.COM

first sticker referenced found:
"Did you see the wikiffiti on that Palm ad?"

It's designed for a more social life... (citation needed)
by jmfp January 08, 2008
The art of vandalising wikipedia
"The wiki for Dick Cheney says he's 1003!""I wikiffiti that shit all the time, yo!"
by I<3Lauren June 05, 2009