Structure Facebook campaigns with one ad per ad set to stop the algorithm from splitting budget across creatives. This reveals which ads actually work, lowering CPMs and giving you reliable cost-per-result numbers.
I'd recommend locking one ad per ad set and one creative within each one of those ad sets. The reason why is because if you had this one ad set and 3 creatives in there and say your budget was $25 a day, well, Facebook's gonna decide where that budget goes. And what's annoying about that is you won't actually know what creative or what test you're doing is actually driving most of the results inside of your ads. So it's really important to have one ad per ad set so you can actually figure out what the heck is working and what isn't.
