People really enjoyed the mention constellation thing. I'm chuffed that on Twitter I've received Tweets about it from five continents, and the thing's been written about by friends and strangers alike. People at work liked it too, which means a lot to me.
The answer to both is yes!
I'm going to do two things. First of all I'm going to post a complete, free, end-to-end solution for generating something like this:
First of all, though, you need to install Graphviz. It's straightforward, especially on a Mac. Go!