facebook is a source of traffic ..... if a person own some pages ..he can use it for many things ... he can make his own website and earn via ad companies like adsense .... pages can be used to sell traffic to other sites ..... can do own CPA or can sell posts to people who do CPA ..lot of options
There are some efficient marketing tools which may do you a great favor. What's more, some company offer BOT as well as related service on facebook.