Some social media campaigns are so nifty that there's plenty to glean from them. Open Forum offers a few examples, such as:
GranataPet's Foursquare-Enabled Billboard
Pet food brand GranataPet earned worldwide attention last year for its billboard in Agenta, Germany. This wasn't just any billboard, though. It was rigged so that if a consumer checked in on Foursquare, the billboard would dispense some of the company's dog food. Someone from Granata's ad agency filmed the billboard in action, and the video now has more than 50,000 views on YouTube (in various iterations).
What you can learn from this: In the social media age, a single ad or a single billboard can generate images, press and videos, but only if it's clever enough.