1. A method of determining the presence of an advertisement in an image, the method comprising: detecting, with one or more processors, a first face in a first image associated with a first geographic location; detecting, with one or more processors, a second face in a second image associated with a second geographic location; comparing, with one or more processors, the first face to the second face; determining, based on the comparison, whether an advertisement with the first face is present in the first image.