John Lewis showcasing the charitable causes that they support and offer their visitors the ability to engage with the page and vote for which charity gets what percentage. This could be used as a platform for selling seconds, with users being able to get a bargain and also see that percentage of the money is going to a good cause. Winning. :)
Land of Nod use interactive elements to engage with customers and potential customers within the facebook platform. They also link their other social media channels such as Twitter, meaning that tweets can be seen on the facebook page.