I have setup my anti-splog following the steps outlined here: https://premium.wpmudev.org/project/anti-splog/
I have also set up my WP comment blacklist using moderation for all-unregisted users and a blacklist from github.
And I am happy to report that splogs have ceased entirely as well as comment spam, however I am still having spam user registrations. I think they must be getting through buddypress registration - yet I have set my registration page to a randomized url - (why didn't someone think of that before? You guys are awesome) and between that and other mesures - spam user registration is down - but still at un-acceptable levels.
I wonder if there is a way to stop this using a plugin here or rules that seem to be working for anti-splog to stop this problem.