I actually hand-labeled the categories, but only for roughly the top 100 domains in each time period. The categories are a little bit arbitrary (where is the line between individual and blog, or blog and publication?) but I was mainly interested in seeing the distinction between individuals and companies.

I'm interested in this as well. Since only top 106 are tagged, it's possible it was done by hand?

edit: nevermind, it's only showing categories for top 106 domains, but if you set the period to 1 year, you can tell that there are more tagged domains. And it's not always 106 domains.