Two things.
1. Is there any way to find the time of day when ads get the highest CTR?
2. I've read a lot about split testing in Facebook, and that it should be done in separate campaigns because Facebook won't deliver even traffic if they're all in the same campaign. So I tested an ad for weight loss with 20 different images in 20 different campaigns and ran them pretty much all day. But Facebook still only favored 2-3 of them. Maybe it's because I had a reasonably low budget? $100. But thats the only thing I can think of. I've been testing 2 ads at a time with a budget of $1,000. But it's tedious doing only 2 at a time. Advise?