An old picture of our mayor, Tom Menino, is making the rounds now that Celtic Paul Pierce got in some trouble for throwing what might have been a gang sign at the Atlanta Hawks. (Next time, he should send the one-fingered salute. Everyone understands that gesture.) [Via Sports by Brooks] So, we gotta ask: Is the mayor flashing a gang sign? ( polls) For further clarification, read Chris Faraone's piece for the Dig that explains......