Facebook Ads used to be the best, affordable tool to promote your business. Still, today they are overpriced and not as good as they used to be due to apparent reasons like spam overload and limited trust in the advertisers on Facebook.
I firmly believe that Facebook is the worst thing happening to humanity today, right after the sea damage. Still, I can not deny that it is an excellent source of quality, organic and targeted traffic. The only thing is to use it wisely.