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I don't necessarily trust all OpenID providers to stop bots. I note that ikiwiki allows [[banned_users]], and that there are other todos such as [[todo/openid_user_filtering]] that would extend this. However, it might be nice to have a CAPTCHA system.

I imagine a plugin that modifies the login screen to use http://recaptcha.net/. You would then be required to fill in the captcha as well as log in in the normal way.

I hate CAPTCHAs with a passion. Someone else is welcome to write such a plugin.

If spam via openid (which I have never ever seen yet) becomes a problem, a provider whitelist/blacklist seems like a much nicer solution than a CAPTCHA. --[[Joey]]

Apparently there has been openid spam (you can google for it). But as for white/black lists, were you thinking of listing the openids, or the content? Something like the moinmoin global http://master.moinmo.in/BadContent list?