Last week, Google, for the first time, opened the doors to some of its data centers to give the public a look at what powers the world's largest search engine. But what about the other big-name Internet company, Facebook? What makes the billion-user social network tick? Where do all the Likes, News Feed posts, and photos go? The majority of it is stored in Facebook's Prineville, OR data center. Take a look one of the most environmentally friendly server farms in world.