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Let's add to the network.  Click on Search and Expand. We now see the concepts of each of the four original people, with people associated with those concepts, connected in a graph showing common interests. Some people have many interests, some have just a few.  Image Removed Note that concepts are always connected to groups of people who have that concept has a research interest.

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Click on the group of people near the center of the map, between linked data and semantic web.  You should see a display similar to the one below.  The group is highlighted along with the concepts common to the group (linked data and semantic web).  Not that the right hand display shows the group as being defined as those people who are interested in both linked data and semantic web. 

Capability Map Reference