I'm using both Facebook and website (not personal blog) to promote products. In many cases and campaigns I need people read my Ads on Facebook and then click on the ads to come on the website and make an order on it. By this way, I can get many traffic from social, and with that traffic I can set up many Re-targeting campaigns to promo more. If you do your own business you probably have all FB, website, twitter,...and many channels to do digital marketing strategies.