How to map connections with great circles
From the post:
There are various ways to visualize connections, but one of the most intuitive and straightforward ways is to actually connect entities or objects with lines. And when it comes to geographic connections, great circles are a nice way to do this.
This is a very nice R tutorial on using great circles to visualize airline connections.
The same techniques could map “connections” of tweets, phone calls, emails, any type of data that can be associated with a geographic location.