We have a retail store with products that we sell.  I can say that Facebook has been huge for us...because we post these new products as they arrive in our store.  I am talking about posting pictures 2-3 times daily.  We typically boost 2-3 ads per week and spend around $150-$250 per month on facebook advertising.  We have had huge success...but it takes time to build this.  In 3 years of consistently advertising in a 50 mile radius we now have almost 10,000 page followers.  We do not sell anything online...but only in store.  People come into our store everyday purchasing the products that we show on our boosts or just on what we post.  You have to be consistent...and putting things on instagram also helps.