Citizen Marketing is where we catalog our favorite baby-Banksy agit-prop defacements of public advertising campaigns. Please send your own Citizen Marketing to tips@videogum.com. THE REVOLUTION WILL BE TUMBLR'D! You know, sometimes it turns out that the best way to deface a poster ISN'T to draw a mustache and some penises on it. Well, that doesn't seem accurate. The best way ...