Agreed that domestic violence is one of the biggest tragedies and technology can play an important role in bringing attention to the things that generally happen behind closed doors, away from the public eye. However, technology is never going to eliminate a social problem on its own. No app will "make the problem disappear, as if by magic". If you really want to tackle domestic violence, I think the focus should not be on "digital responses to social problems" but rather how technology can enable social responses to social problems. I'm not saying anything against the apps mentioned, they look good, I'm just commenting on the overall tone of this post.