Marketers are increasingly willing to take a chance with edgy online comedy clips, as long as they're produced by professionals, according to an Advertising Week panel. "User generated content is less and less interesting to clients," said Josh Abramson, co-founder of the CollegeHumor Web site. "We're more and more focused on original comedy. You don't have to be constricted by typical guidelines. But you're constantly walking a fine line."