Ah, sorry! Such an oversight! (You get so involved in a project you think it's all natural...) The histograms are: For Reddit, they are of a headline's votes,

Ah, sorry! Such an oversight! (You get so involved in a project you think it's all natural...) The histograms are: For Reddit, they are of a headline's votes, of a headline's number of comments, and of a comment's votes. For Delicious, they are of the numbers of users that have bookmarked a link, or applied a tag. For Digg, of a headline's diggs, of a headline's number of comments, and of a comment's diggs. For Hacker News, of a headline's upvotes, of a headline's number of comments, and of a comment's upvotes. For StackOverflow, of a question's views, of an answer's votes, of the number of users that have applied a tag, of a user's reputation score. It's hopefully all obvious once you install the script. Adding larger versions of the screenshots in a sec..