n. The set of ideas, topics, and things in which a person is interested, particularly a digital or online representation of this set.
To put this development in a broader context: the mood graph has arrived, taking its place alongside the social graph (most commonly associated with Facebook), citation-link graph and knowledge graph (associated with Google), work graph (LinkedIn and others), and interest graph (Pinterest and others).
Twitter possesses a different kind of advantage, and it's known as the interest graph. Whether it is your favorite brand, your favorite team or your favorite celebrity, Twitter allows you to keep up with what you find most interesting.
What we envision is that there is a new dimension of interests that emerges over the social graph, you can call it the interest graph.
The "interest graph" is a representational structure which can chart what players find of interest in a MUD.