As far as I know, Facebook advertising works somewhat like an auction. So you probably have too much competition for the same audience. Try to narrow it down by make it more specific. Try local first, for instance and experiment with that. After a while you’ll know what works and you can start working with ‘alike’ audiences (a new target audience which is similar to the audience that already engaged with your content) in other places.
- media. net
etc.. If you think we missed few sites you can comment below.