What happened to the blog post Closing questions: how do we compare? from February 2013?
I have found a link to this blog post on another meta where it was mentioned as a source of an interesting graph comparing percentage of closed questions on various websites. When I wanted to see whether this blog post contains more details about how the data were obtained, I found out that the post does not exists.
Google search for "closing-questions-how-do-we-compare" shows that this blog post have been mentioned on this site's twitter account and in chat.