Discover Central Corridor Green Line

I found this (see photo of Discover Central Corridor Coupon Book) littering my sidewalk. Yes littering. It was not placed in the mailbox (which I realize is a federal crime since it was not delivered by the USPS), it was tossed randomly onto my sidewalk like a newspaper, except it isn't a newspaper, I didn't subscribe, and hence it is littering. Wikipedia: "Litter consists of waste products...