This is super-interesting, thank you for posting. Where did you originally get the data from to do this analysis? Have you been harvesting it yourself?
Looks like a few of the top posters stopped using HN as much >2011. Are there some public traffic stats for HN? I'm curious if this was around the time when HN became flooded with new users. The quality has somewhat declined since then (as with all communities).<p>Although, tptacek is still an HN machine.
See kibana3 dashboard <a href="http://hnk.aws.af.cm/index.html" rel="nofollow">http://hnk.aws.af.cm/index.html</a> , data from hckrnews.com data, elasticsearch qbox.io, hosting in appfog.