What a beautiful way to map out the terrain - I immediately feel inspired to use this as a starting point for hobby-research projects. Only problem is now i'm inclined to check the alternatives to "ego graphs" as a starting point for research!

I have a sneaking suspicion that SEO/keyword mapping with all the resources devoted to that space may have some tools that elaborate on this idea - though im no expert. If anyone knows of useful tools to replicate this in browser I am all ears.