http://www.boredpanda.com/powerful-social-advertisements/

I think this collaboration of advertisements is extremely interesting. They are not just advertisements in public places that can be eye sores, but they are advertisements that address social issues occurring around the world. The ads are effective because they encourage people to stop and think and not only for two minutes while they are walking by or sitting on a bus. The provocative and alarming photos in the advertisements leave a lasting impression on the viewers- which is exactly what distinguishes successful advertising from unsuccessful advertising.