Wikipedia cofounder Jimmy Wales sat for an interview with ad agency exec Liz Ross in front of an Advertising Week audience here in New York yesterday. Which is odd, because Wales's very popular Wikipedia is a nonprofit which doesn't carry advertising, and Wales's for-profit venture, Wikia, isn't very popular. So who cares what he has to say?Wales himself, obviously. He can't resist a chance to burnish his image as a font of wisdom regarding all things Internet, no matter how irrelevant his experience might actually be. AdWeek's Brian Morrissey reports Wales used the word "authenticity" more than a dozen times while on stage.