I am doing this for quite sometimes now. I am using Facebook Ads to promote affiliate products, with the simple trick to minimize advertising budget(as i shared before), i can earn $100 daily with just $100 of marketing budget. Traditionally, Facebook will reject any affiliate links that you want to promote, but by using simple and free wordpress plugin called(wp ninja) i can convert the affiliate links to a simple and accepted links. I am hoping this will give you some ideas how to optimize facebook ads to earn money online. anyone using this method? Please let me know.
If and when everybody starts doing this Facebook will catch on on what's going on. In other words, I don't think it's going to last for too long before Facebook blocks that too.