I think it somewhat depends on the kind of network you have but I generally recommend against open registration for blogs and, instead, have people request a blog with you instead. Yeah, it’s a bit more work and yeah, it takes away some spontaneity – but the reality is you’ll have tenfold the amount of work with monitoring for SPAM blogs AND people that do the spur of the moment “let’s start a blog” thing are not your long term bloggers either. What’s the benefit of having 100 inactive blogs on your network? I’d rather have 5 that update daily with solid, quality content. As with many things in life, quality trumps quantity any day of the week.
So, it may sound a bit counter-intuitive but I’m all for slowing down to speed up with blogs/members that are worth your effort.
I have had a major spam attack on my new instalation… over 100 new blog and user subsriptions that are definately spam… how can i over come this…
they are signing up and then confirming the email…
shall i put a human idendifyer on??
Best look in the WPMU forums for things (plugins) to help. Off the top of my head, some of the better ones are WP-Hashcash, Signup Question and Admin confirm new blogs. Hashcash is available at https://wordpress.org/extend/plugins and the others are at http://wpmudev.org/plugins/
Loads of good ideas though in the WPMU forums and that is the best place to start looking.
Trent
