Go work at a company with a $100M+ online advertising budget :)
Sorry for the trite answer, but this kind of knowledge is so new and ever changing, and there is so little incentive for it to be documented externally, that if you're really interested in it, the best way is to become one of them.
I think this is rather old-school, actually. They are using FB in the same way they use TV and newspapers, etc. Positioning and maintaining status at top of mind in the consumers' consciousness.
I believe reading ad-tech blogs would be a good start as well as industry sites such AdAge, Digiday, and the blog on Thalamus.co. (I do not work for any of these sites, but have contributed thoughts)
Sorry for the trite answer, but this kind of knowledge is so new and ever changing, and there is so little incentive for it to be documented externally, that if you're really interested in it, the best way is to become one of them.