Facebook and CPA?

I am advertising a offer around the world for free tickets to a event and would like to momentize with Facebook such as messaging people. What is the best way of doing so? Do it manually? Will I get banned? Should I use adwords or facebook ppc?

normally i'd suggest leadbolt or ******* + misleading schemes (click jacking and such) x idiotic users = big big $$$. use several fake accounts though or you will get banned and blocked quickly. content unlockers all the way. those kids will fall for anything. However since you have real product to give out, you don't need to be misleading, so i think you don't break any rules for f*cebook, so you should be protected. use the content unlockers and give your tickets after the user completes the required surveys.