I'm getting tired of these pay per download sites or pay per image view sites because for some reason no one is downloading my photos from them. Now I want to try and make revenue from the visitors (it will almost be like making money per view/download). I have a free site and I have young people that will view my photos so I was wondering what were some good pay per impression sites that would not show adult content or do anything annoying or harmful to my users? If there are none that are good for free sites, then what are some good ones for small cheap sites? About what is the minimum traffic amount?