I just stumbled upon Osocio today. It's an interesting site that describes itself as being "dedicated to social advertising and non-profit campaigns." It's a blog that collects and links back to a variety of non-profit and activist advertisments.
They collect posters and ads from around the world- and there are some that I think are really interesting- like these DV ads. They're visually striking, and I think that they illustrate the point well (that the threat of violence doesn't always come from outside).
I also like these ads about teen romance, dating, and sex, advertising Real Life. Real Talk., which was initiated by Planned Parenthood, and seeks to "positively change the social climate in communities by creating more open, honest, and balanced talk about sex and health" and "reframe sexuality as a component of healthy relationships, instead of as a commodity, the way it is often promoted in popular media."
Anyway, it's a very cool site- go, check it out!