BuddyPress.org

@all

I’m using these 3 plugins together and have no bot signups at all on WPMU2.9.2/BP1.2.3.

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RPX

WPMU Super Captcha

The occasional stubborn human does drop by once in a blue moon, and these few only manage to get through using RPX and an existing account, or they really take the time to fill out the registration form. Email domain banning and persistent account termination seem to be the only solutions in these cases.