Marc A. Smith likes to say that he practices "crowd photography for the cyber-square." That is, as the chief social scientist at the Social Media Research Foundation, he studies computer-mediated collective interaction. One place where he focuses his attention is on the social relationships that you can discover among Twitter users, using a network mapping tool called NodeXL that works as a free extension on Excel. The social graphs that Smith makes show the connections between people as they congregate around an idea and/or an event. Years ago, he built me some images mapping the conversation around the 2012 Personal Democracy Forum, and also looking at the following around various surrogates for the Obama and Romney presidential campaigns.The other day, in response...