I wonder how does dang manage it everyday. HN moderation can be so tiring. There is multitude of comment types: insightful, accusatory, snarky etc. And dang does point out the egregious ones every time.
Wikimedia's statistics tools for its wikis includes a bubble chart of number of edits by a user per hour of day per day of week[1] (AFAICT a type of graph called a punchcard chart), used precisely for when you wonder this about a Wikimedia user.
That and other detailed statistics are only shown for users who opt in, but anyone motivated can process a database dump locally, even using XTools itself, which is open source. Edit history can reveal a lot of information about a user, so this an inevitable privacy problem for any scrapable site.
