What is even more interesting (I know, a perfect opportunity for me to be punny and say "pinteresting", but I feel that has already been run into the ground) is the concept of an "Interest Graph." Vaynerchuk proposed that while Facebook covers mapping your social graph, Pinterest is providing great data in mapping user's interests. He states that Facebook has left the arena of interests wide open, but I would tend to disagree to a certain extent. I believe Facebook addressed this area with creating fan pages and groups, so I can find things that interest me and "Like" or join them.
What Pinterest does better than Facebook is add an additional layer to our interests - or as one of my former colleagues preaches to me is another level of granularity (Thanks, @masiclat!), which simply means breaking something down into its smallest detail. While Facebook allows me to "Like" a page on Information Graphics, it does not allow for me to be more specific in what I like about information graphics, nor does it allow me to develop an understanding about what other people like about information graphics without a dialogue.
Pinterest creates an outlet for me to gain a better understanding - both visually and textually - with greater details on what individual users like about a certain interest. Going back to the information graphic, I pin specific information graphics and add a caption to identify what it is or why I like it. By providing this information, you can develop a deeper understanding into what I like about a specific information graphic and allowing you to share/connect with other individuals with that particular interest - in a fun and visual manner.
By graphing user's interests, this provides users, brands, and companies an insight into our specific interests that can be used in many different ways. It will also help build connections among users and show what other visuals tie back to that particular image. Look for Pinterest to continue to pick up momentum over the upcoming months and it will be interesting to see how brands and companies integrate (or don't integrate) Pinterest as their marketing agenda.