Spammers, that is. Scum, all of them. Today this blog got its first comment spam, selling a medication that I have no wish to advertise on these pages. The spam was deleted pretty near instantly, so the spammer was wasting his time. (Spammers are not only scum, they are idiots.)
If you are also running WordPress and being affected by comment spammers, you might want to read this thread on the WordPress support board.