A short time ago, I had a spam attack here. Essentially, one source got some of its spam past the WP guard and it was published as comments and yet its own spam was also put in the light, moderate and bad lists as well. I don’t understand the technical means by which a previously unpublished IP address was published, nor when I took certain measures I don’t wish to give away, it stopped.
I suspect it was a trial run, testing the waters. If the worst comes to the worst and even moderation won’t check it, then the old site at blogspotdotcom will be home to the blog, followed by the free WP and then Tumblr.