Facebook is the future of marketing.
Done right Facebook beats Adsense hands down, but marketers are smart this time. We don't go around sharing out Facebook advertising secrets the way we did with Adwords.
Who wants to create competition?
I remember when people "including myself" starting posting Adwords tip and secrets.
Get rich quick ebooks popped up, and the amount of competition increased big time.
With Facebook i won't tell a soul what to do, because i don't want any idiot with a $500 credit limit trying to take a piece of my pie, and increasing advertising cost.
Tons of webmaster are making great money on Facebook, but we are not sharing, we learned from the past.