How do you best define the marketing goal for your Facebook ad?
HOW TO MAKE YOUR FACEBOOK ADS WORTH YOUR MONEY
Why are you running the ad and what is the outcome you wish to have happened? In most cases, you want to spend money with the goal of attracting enough customers who spend money so that you have a positive return on your ad spend. All advertising should have a budget with a goal that it needs to meet and this can only be accomplished if you track your advertising results.