an updated look at README.md files from bl.ocks.org that contain links to other bl.ocks with data gathered in early May 2016.
click on a node to view that bl.ock
community detection done with the jLouvain library
source data and scripts used to generate the graph data are at this repository. thanks to @mbostock for removing missing nodes, solitary nodes, self-links, and redundant links. The original dataset contains 2,101 nodes and 8,617 links, and is 1.2 MB. The cleaned dataset contains 1,238 nodes and 2,602 links, and is only 281 KB.
this example also sets the fill-opacity for the nodes to 0.7 so it is more apparent that clusters are in fact comprised of many small, equal-radius individual nodes.
many bl.ocks informed this example: