Involving fans in a “voting excercise” is a always a great way to engage them and encourage them to share your content. This Facebook application we developed around Def Leopard's digital release of two of their classic songs asks fans to vote for (and share) their favorite song. The application also promotes the sale of the two songs on iTunes and Amazon by providing a preview and buy links as part of the overall user experience. We are big fans of providing multiple reasons and incentives for fan participation, that’s why we also threw in a sweepstakes component to up the ante and get great participation.  Primary Wave Music wisely structure the rules to include U.S., Canadian an U.K. fans, casting an even broader net, a great idea given that Def Leppard’s fan base is very much international. Check the application on the Def Leppard Facebook page.