Several people have asked for instructions on how to do the reblog graph, so here they are. I realize this is a post that's all about tumblr but I'm posting on DW. That's because while Tumblr is *great* for virality, I still refuse to use it for long or complicated text posts, at which it is terrible.
This isn't necessarily the best way, but it's the way I can do it at work, with no expertise, without downloading any software. (If you want to play with really powerful network graphs, download the open source package Gephi - as a bonus its sample data set is a network chart of Les Miserables characters!) But Gephi is hard. Here's how to do it with just Notepad, Paint, and Google.
As my example, I decided to use a post from someone who is authentically popular on the internet, unlike me - friend and artist Kevin Bolk of Interrobang Studios. Specifically, his Sexy Astrophysicists Art Card Set (As of a mid-April 2014 when I started writing this post). I've made the Google Fusion link public if you want to play without starting from scratch: kbonetwork.
Here's how to start from scratch:
( Step I: Acquire and clean the data )
( Step II:Make a spreadsheet )
( Step III: Load the data into Fusion Tables )
( Step IV: Make the graph )
( Step V: Share )
Result:

If you try this and have issues, drop a comment to this post, and I'll do my best to answer.