I have deleted all nonexistent blogs as well a couple of unrelated blogs, separated the abandoned blogs from ones which are still active, and the result is as you see it. Down from 212 to 110. This was not a methodical business, I have made some mistakes here and there but the error margin could be by the approximity of 1 to 5 blogs.
This is one of several ideas I have for this site, and perhaps the most boring. Expect more in the future.