Re: Spam Blogs
I am also having this problem – I guess everybody is. I also followed the tips you mentioned and initially, it reduced splogger registrations a lot.
However, I disagree with Terry: there are not real people setting up blogs and answering captchas, these are bots. As kiwipearls mentioned, if you go and try to sign up manually, you have to fill in the required fields.
There is a leak somewhere in BuddyPress/WPMU registration and all methods to stop the oil have failed until now. BP (haha) people say it’s WPMU and the other way around, I guess. The leak has been here for months and nobody seems to want to fix it. Maybe it’s some kind of corruption since the premium site Terry mentioned has a way to fix it.