Good friend Josh Barsch's Straightforward Interactive company has made a number of big splashes around the world with his clear understanding of Facebook and Google advertising. He is the foremost expert in this region.
He was recently featured in the US edition of the Guardian (a British news organization) for his work on Mayor Sam Kooiker's campaign against Alan Hanks. It's a good and interesting read here.
I seem to recall another advertising professional telling me and others that Hanks would "kill" Kooiker in social media. Didn't happen.