I just got hit with a spammer who seems to think he can join up as a follower so we buy his stuff. If you want to block him (and please do before he goes viral) here are the instructions from the help. Pass this on to anyone you think might be interested.
You can block them by doing it through your Dashboard. Then click on Followers and from there you can block. You can't seem to do it by clicking on the little follower picture. Darren the Vitamist guru is now gone!!! But I see him as a follower on many of your blogs.