Social networking is the art of connecting with those who share common interests. Facebook is a social networking. People have been “facebooking” each other for about 6 years now, making Facebook the most used social network with over 350 million users worldwide. But how does Facebook work? In this article, I will discuss Facebook’s inner workings, covering its architecture and frontend/backend infrastructure—the nuts and bolts that hold Facebook together.
http://www.makeuseof.com/tag/facebook-work-nuts-bolts-technology-explained/