8.3 The Social Graph

At the heart of Facebook’s appeal is a concept Zuckerberg calls the social graphThe global mapping of users and organizations, and how they are connected., which refers to Facebook’s ability to collect, express, and leverage the connections between the site’s users, or as some describe it, “the global mapping of everyone and how they’re related.”A. Iskold, “Social Graph: Concepts and Issues,” ReadWriteWeb, September 12, 2007. Think of all the stuff that’s on Facebook as a node or endpoint that’s connected to other stuff. You’re connected to other users (your friends), photos about you are tagged, comments you’ve posted carry your name, you’re a member of groups, you’re connected to applications you’ve installed—Facebook links them all.A. Zeichick, “How Facebook Works,” Technology Review, July/August 2008.

Facebook was established in the relatively safe cocoon of American undergraduate life and was conceived as a place where you could reinforce contacts among those who, for the most part, you already knew. The site was one of the first social networks where users actually identified themselves using their real names. If you wanted to establish that you worked for a certain firm or were a student of a particular university, you had to verify that you were legitimate via an e-mail address issued by that organization. It was this “realness” that became Facebook’s distinguishing feature—bringing along with it a degree of safety and comfort that enabled Facebook to become a true social utility and build out a solid social graph consisting of verified relationships. Since “friending” (which is a link between nodes in the social graph) required both users to approve the relationship, the network fostered an incredible amount of trust. Today, many Facebook users post their cell phone numbers and their birthdays, offer personal photos, and otherwise share information they’d never do outside their circle of friends. Because of trust, Facebook’s social graph is incredibly strong.

There is also a strong network effectAlso known as Metcalfe’s Law, or network externalities. When the value of a product or service increases as its number of users expands. to Facebook (see Chapter 6 "Understanding Network Effects"). People are attracted to the service because others they care about are more likely to be there than anywhere else online. And that large user base has also attracted all sorts of firms and organizations looking to connect with Facebook’s masses. Without the network effect Facebook wouldn’t exist. And it’s because of the network effect that another smart kid in a dorm can’t rip off Zuckerberg in any market where Facebook is the biggest fish. Even an exact copy of Facebook would be a virtual ghost town with no social graph (see Note 8.21 "It’s Not the Technology" below).

The switching costsThe cost a consumer incurs when moving from one product to another. It can involve actual money spent (e.g., buying a new product) as well as investments in time, any data loss, and so forth. for Facebook are also extremely powerful. A move to another service means recreating your entire social graph. The more time you spend on the service, the more you’ve invested in your graph and the less likely you are to move to a rival.