Re: Fighting Splogs
stwc’s summary of methods does seem to stop a lot of spam, but I’ve still been having some. I tried SI Capthca (https://wordpress.org/extend/plugins/si-captcha-for-wordpress) but that seemed completely ineffective.
My latest weapon in the war has been to modify Invisible Defender (https://wordpress.org/extend/plugins/invisible-defender) firstly to make it work with the buddypress registration page and secondly obfuscate its hidden fields by giving them random names and values:
http://bcbc.co.uk/mu/blog/2009/12/11/wordpress-registration-spam/