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I would try to prevent member registration through .htaccess:
http://wpmututorials.com/how-to/spam-blogs-and-buddypress/
If not .htaccess, then try WP Hashcash, but I prefer the simplistic method of blocking through .htaccess. This will block most spam signups, but of course you can’t block everything!
Thanks to Darcy Norman for the original tip!
See also: WordPress.org • bbPress.org • BuddyPress.org • Matt • Blog RSS