Hi all,
After a while not even opening my blog, yesterday I did two posts. While the administrator interface seemed fine, readers quickly notified that it was showing lots of spam in the regular view which I confirmed using Chromium’s private browsing. Investigations led to dozen administrator accounts in WordPress database, then I decided to reinstall from scratch. Unfortunately yesterday was a busy day and I could barely stay at the computer to do so.
Anyway, this morning I restored my blog and I’ll try to keep it updated 
I also changed the comments rule, instead of requiring people to register, I instead opted to close comments after 14 days, since most spammers seems to look for pages with reasonable pagerank and new pages do not have them that soon.
Welcome back