Commenting glitch fixed
Yesterday sometime commenting became impossible -- it wouldn't even let me post test comments. I knew it was a general problem when I didn't wake up to see 10+ spam comments. I fixed it ... when you delete a spam comment, you can also block mention of the urls it's promoting. Sometimes it's a list of a dozen. Yesterday one of those lists must have contained a blank space, I didn't catch it and banned them all... with the result that all comments were blocked, since everything but a one-word comment has spaces. Anyway, fixed it.
It's also possible that that is a new technique for spammers to try to sabotage antispamming. I've seen things like that before. Listing a huge load of completely fake urls, together with the one they want to promote, putting in urls that if banned will stop a lot of legit comments, etc. Lately someone has invented a robot that will insert words from the post title to try to make it sound as if it were a real comment.