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]
How to Make a Contour Map
Using Color Scales and Palettes in R
Build Interactive Time Series Charts with Filters
Visualize This