A reader sends in this photo from an advertisement on the L: "I noticed this ad on the red line today from Potbelly that mentions a new "Uptown" chicken salad. It seems odd that Chicago-based Potbelly would name a salad "Uptown" yet have no location here. I would love to have one here! We have plenty of empty storefronts. Maybe we can get UU readers to flood Potbelly with emails suggesting they open a store in Uptown?"