interest graph
n. The set of ideas, topics, and things in which a person is interested, particularly a digital or online representation of this set.

Example Citations:
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.
—Adam Wexler, “Why Twitter and LinkedIn Will Outlast Facebook,” The Huffington Post, August 14, 2013

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).
—Evan Selinger, “The ''Mood Graph': How Our Emotions Are Taking Over the Web,” Wired, August 19, 2013

Earliest Citation:
“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.”
—Santiago Sir quoted in Nicholas Deleon, “TC50: Popego Tailors the Social Graph to Your Interests,” TechCrunch, September 9, 2008

Interest graph is not to be confused with the more famous concept of the social graph, popularized by Facebook CEO Mark Zuckerberg, which is a map of a person's online social connections.

Here's a much earlier citation that focus on a particular topic — the multi-player games known as MUDs (Multi-User Dungeons or Multi-User Domains):

The “interest graph” is a representational structure which can chart what players find of interest in a MUD.
—Richard Bartle, “Hearts, Clubs, Diamonds, Spades: Players Who Suit MUDs,” MUSE Ltd., April 15. 1996

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