BuddyPress.org

@Bbrian017 I actually do that by manually logging in once of twice a day, and marking users and blogs as spam at my discretion. If in doubt I email the person who signed up and ask them something a spammer wouldn’t know. My site is aimed at users in my country only so there are many things I can ask them that genuine users only would be able to answer. Its tough going.

I think there must be someway to do this through WP though as you can do this with many other CMS’s and forum scripts where you can only allow registrations after approval