Re: BuddyPress Spam
Askimet does great catching spammers comments on regular WordPress installations, but WordPress MU is commonly the target of spam registrations, which is my problem. I tried reCaptcha and the same day had to delete spammers.
I’m hoping a future version of BuddyPress or WPMU will include finer security, allowing admins to block access to only humanly-registered users, rather than either shut off all registrations. Another possibility would be to follow the example of WordPress and allow admins to relocate or rename the registration component.