We ran Facebook Ads For Shopify Drop shipping Store, first of all we started advertising on one product, we did creative testing, and then interest (audience) testing i.e. created 3 ad sets, open(no targeting), broad(containing broad keywords), stack(containing the most relevant interests related to the product), after the campaign was on going, the ad set which contained broad keywords (broad ad set) was giving us more sales then other ad sets, on 2nd number was stack ad set which was giving us more than the open ad set.