Yes. Your ads might still be influencing people, even if you don’t see any immediate manifestation of that in the short term. This is because many ads can have a delayed effect.
For example, a woman might see your ad for your hair salon and make a point of giving it a try next time she needs a haircut. In that instance, you won’t see any data from the social networks to tell you that you lodged a positive intent into her mind. You will only see her arrive as a new customer a few weeks later, without knowing she is there at least partly because of your ad (that has probably stopped running by now).