Possible? Of course! With hard work and effort, everything is possible! Easy? It really depends on how you promote yourself, the people you’re targeting to, the product itself and its price.
Facebook now has an option to share the stories you like and pay for it (that’s what they call sponsored stories)! That’s a way of promotion as any other, like Facebook’s ads. Of course, you can do lots of things to promote your business and get to your goal… but the very first thing is to create a Facebook page (careful, I said page, not profile. Profile is what you use as a person that wants to get in touch with friends. To create a page, you need to have a profile first ;). Also, don’t confuse it with groups which is the third type of page you can have in Facebook)
Create an attractive Fan Page having cool graphics and valueable information. Then keep your targeted client updated with some interesting information. donot always send them promotional offers they will get board of you leave you. your communication with them should be of personal nature because on facebook people come to enjoy their online community not to read the boring marketing material.
In the case of facebook ads I don’t know, I would assume that sending people to a landing page or affiliate links just as in Google. From Fan pages because you can sell the product without leaving facebook.