I am always sceptical about Ads on Social Platforms like Facebook or other places. They are great to get attention for short time of period from real users, but in long run I still think it’s waste of money.
Here are some evidences by BBC’s technology correspondent Rory Cellan-Jones, that Facebook’s revenue is based on fake likes. Well it’s up You to belive or not.
Video by Veritasium about Facebook Ad Fraud and user Likes