I am one of the developers that built sizzleanalytics.com. We built this tool using d3, dc, and crossfilter.
We'd love for it to become the "github for data visualizations". You can upload your own data,
clone or fork public visualizations, or keep your data private, all for free.
We're actively building out new features, so we'd love to hear your thoughts.
If you're interested in how we gathered the data for this visualization, here is a blog post about it:
Archives of all 10MM json files are available there as well.