Map of Reddit
Reddit user Laurel Quade mapifies the wonderful world of Reddit. Each country represents an area of interest, and "cities" are sized by inhabitants. I'm not familiar enough with the communities to know how accurate it is, but judging by the comments, I'd say pretty good.
[Redditland via @adamsinger]
Data Points
Small Multiples in R
A Survival Guide to Starting and Finishing a PhD
How to Make an Animated Growth Map in R
Visualize This