This may not be the Holy Grail of Advertising but it sure comes close.
I am a man of few words so I'll cut straight to the chase.
http://becomeyourownboss.me/freebies/

You may ask, ' so if it's free, why do I need to sign up?'.
Don't worry, I have an answer:
Sign up is necessary to preserve the truth of the process.

Can you imagine if your free traffic were bots?
Google's bot proof logo appears at the bottom right of the image (in the corner)

Once you are certified then you can be let in.